Well obviously they want it, they voted for it. They probably see the situation in terms of something like class war. There are a bunch of people they don't like in society and they want to identify and marginalise them.

As for why politicians turn out this way, they're just pretty ordinary people (often quite impressive people actually, relative to the norm). Most people don't get an opportunity to show off how useless their political principles are because they have no power or influence. That's why there is always a background refrain of "please stop concentrating power to the politicians it ends badly".