Private security can be really good, particularly with the kind of funding he has.

However, what private security can't do is close down access to buildings, block roads, and similar actions that require official weight to throw around. Not impossible to achieve the things that the SS can do, but it's a lot harder, and a determined group or individual will find a way.

Don't forget that the SS managed to let a sniper slip through on trump. So, even those full resources can fail, and if the asset is an egomaniacal jackass that thinks he's smarter than anyone around him, it becomes even harder to close all the gaps in security. With the reduced reach of private security, even the top end military trained guys, there's limits to what gaps they can and can't close.

It does mean that any sniper would have a narrow window of opportunity, likely only one shot. But there's other ways to get to someone that don't require that kind of precision. Assuming the person or persons taking action don't care about getting caught, there's a lot of options.

If they also don't care about collateral damage, things open up even more, and musk can't prevent things flying over him the way a president can. When you're talking about the potential for state actors, someone dropping a plane on him isn't entirely out of possibility, though incredibly unlikely.

I don't think that he is smart enough to have any. I think that he is narcissistic enough to think that everyone love him.