My guesses:

• Intoxication: They're drunk or high enough that they're not neurologically capable of aiming; the fact that they managed to get it out of their pants at all is astonishing.
• Narcissism: They're very important assistant sales managers, talking on their phone through the whole transaction, and aren't paying attention to what they're peeing on; just as they don't remove their dirty dishes from the office meeting rooms after a lunch meeting. Aren't the help supposed to do that?
• Helplessness and/or disgust: The toilet was already filthy when they came in, and they didn't think they were making it any worse.
• Peevishness: They got yelled at by a scary janitor once for sticking gum under desks.

Related question, why the fuck do some people feel it necessary to grunt, moan, pant, and otherwise loudly vocalize while shitting? Zero people want to hear you, shut the fuck up, you are gross.

This is more of a rant isn't it

I use the sink so no one can blame me for the toilet seat

Can we not bring over these ranty non-questions from reddit please

It’s not just men and unfortunately it’s not just piss.

It's not exactly an open-ended question but you seem to be having fun with it. Leaving the post up.

I did a practicum in a federal prison for a year and somehow my supervisor and I got onto the topic of bathroom use (probably just talking about the reality of incarcerated live). I'll never forget it because it was such a candid moment for him when he said: real thugs sit. Nothing else added, just let it be said like that. People that don't clean up after themselves definitely grinds my gears.

I've thought about this a lot over the years, I think it's just as simple as "all care, no responsibility" meaning if the average punter goes into a public toilet and somebody hasn't cleaned up after themselves (mistakes happen) then that dude sure as shit isn't going to clean up but he still needs to go therefore he'll do his best to be clean but if he has to do some sort of gymnastics to keep himself clean then so be it and if the toilet gets messier as a result of those gymnastics then so be it, the cycle continues.

I used to hate urinals and I still don't like them, but I understand the reason behind it, people are animals when it's not their property.

As men get older, it becomes more challenging to initiate urination. As a result, the distance the urine stream travels at the beginning becomes unpredictable.

On the other hand, towards the end of urination, the stream becomes weaker and may cause post-dribbling. This also increases the chances of hitting the toilet seat.

Failing to clean the toilet seat afterward is simply pure rudeness though.

true story. my son has a bit of a phobia for public toilets and one day I was out with him and his sister in the city, riding ferry etc. I could see around lunchtime he needed to go, but he refused as he usually does. after lunch it was obvious he really needed to go and wouldn't make it back home in time (1.5 hour train ride plus time to get back to the station). there was a nicish public toilet at Manly Beach and I walked him in, he had agreed to try as he was clearly desperate.

but he decided no he couldn't go.

so we catch the ferry back to Sydney. again I asked to take him into the toilet as it was quite nice, but he refused. as we got to the train station, there was no excuse. he was bursting. had to go and had no choice. took him into the toilet. it was without a doubt, handsdown, the worst I had EVER been into. there was shit in the floors, smeared on walls, on the frikken toilet seats. piss everywhere. he had no choice. thankfully there was toilet paper.

I cleaned the seat as best as I could with toilet paper. he went.

we disinfected the shit out of both ourselves when we finally got home.

As for OPs question, some people are just plain animals

It's so universal too, it's like I have to clean every single toilet seat before I use it.

Men? Have you heard about the women's?

Also wash your hands afterwards! The pandemic should have highlighted the importance of basic hygiene.

Some men will be experiencing problems such as “hesitation” (they step up to wee but nothing happens for a few seconds), a poorer stream than they’re used to and “terminal dribbling” (they think they’ve finished but quite a few drops of urine continue to dribble out - in addition to hitting the toilet seat it might drip into their underwear when they put their penis away). They might even have problems with needing to go very often or all of a sudden.

Symptoms like these can mean that there’s a problem with urine being able to flow out of the bladder easily. One thing that can cause this would be a problem with the bladder, but it could also be a problem with the prostate. You don’t have to be super old for this to start happening.

Regardless it is worth getting symptoms like this checked out with a doctor and making sure it’s not something serious; even if it isn’t, there might be treatment that can help with the symptoms.

Should still wipe the seat when done, or have a tissue handy to catch the drops before they get anywhere.

This is why I think everyone should sit down and pee

we stand and pee, sometimes it splatters