Having seen it unfold, I’d struggle to assign the blame to a single party, because they were all dumber than the others. Here is how it happened:

• 1 stopped far too early in the junction to wait for 3, which was an entirely unnecessary wait anyway (1 being dumb)
• 2 moved to the lane even though 1 was blocking them (2 being dumb) — I presume 2 did that because 3 was far away and surely 1 would make their turn well before 3 arrived at the scene
• 3 drove close to 2 and blocked 1 instead of allowing 1 to turn, thus completing the gridlock (and trifecta of dumb)

Google slide was the one I had handy while on my sofa, but in principle you’re right as it’s a copy anyway.

Looks like 2 is the moron, no? I'm guessing 1 was waiting for 3 to go past and 2 was waiting for 1 and 3, but just pulled out into the road in front of 3

Luckily the driver behind 3 wasn’t dumb and left a big gap. After what seemed like an eternity 1 understood what to do and managed to go around 3 driving over the kerb.

If this was 3 people who actually knew how to drive then the situation would have never occurred. Someone has pulled out into the path of traffic with nowhere to go, and the other 2 have decided to be petty instead of leave space or reverse and resolve the situation in 5 seconds.