Ideology. Like adopting a strict ideology and then refusing to hear anything from any other ideology. Like sometimes Capitalism is the solution, sometimes Socialism or Government intervention is the solution. Usually it's a mixture of both. But no we must divide strictly into our little boxes and demonize anything else.

And of course social political issues which are bound up into ideology no matter if it makes sense or not. Of course that is the wedge used to divide people while the powers that be fill their pockets. By all means let's all argue about who gets to use what bathroom while food becomes unaffordable and housing becomes a pipe dream.