It’s hard to know how much of the time they actually believe someone is guilty, vs just going along with the group, though. There’s a strong incentive to vote with the group because otherwise if someone is a traitor you look suspicious. And if the conversation is going after one person and that isn’t you, you’d like it to stay that way.
I don’t think it necessarily reflects how a jury etc works. If you acquit, you don’t have to choose someone else to accuse. You’re not going to face accusations yourself. You don’t have to repeat the process every day.
On your second point, I’m sure the UK second season changed the order to eliminate that, but it’s back this season. I’m sure a player mentioning it would be edited out though, so it’s hard to know if anyone assumes it’s still the case.