The US has never had a situation where the rule of law collapsed, and mobs were actively trying to kill the elite. ("Elite" here meaning those with extreme amounts of money or social status.) In places like Europe, they remember things like that.

So if you're an elite there, you don't make waves or have a high profile, because you know from history that doing so can attract attention of a kind that you really don't want.

But in the US, that's not in your history. So, especially if you're rather narcissistic, you think of using your wealth to get attention.