>Basically, say I maintain a blog. Should there be limits on which ideas I'm allowed to express on that blog? Should I be thrown in jail if I express a "bad" idea?

Aren't Al Quaeda and ISIS websites shutdown all the time? If ISIS was using 8chan to spread Jihadi propaganda that ended up leading to killing on US soil, they'd be shut down quick. But since the extremists belong to a political side, it's called free speech. When Twitter/FB/YT/Reddit remove such speech, it's spun as political bias.