That's because the naive general public do not see the future problems made possible by willingly bending over and allowing governments and other groups to censor us.
If they're banning entire websites right now for simply having a video posted on them (and yet not for the countless ISIS videos, hmm what a surprise), imagine where we'll be in the near future. I seem to remember the Nazis going down the same route...
Stuff gets removed from the internet ALL the time, I suggest you watch: