Although I have never boarded any cancel buses, I can understand that there are some comments that can be offensive to some people. However calling on everyone to block/ban accounts because of this is wrong. As stated, if they post truly offensive comments, and they're mass blocked, who will be there to submit reports?
Personally, I am able to just ignore comments that I neither like, nor agree with. Reporting comments that are violating TOS, and banning/blocking specific users for their gross abuse of the site. These are the best uses of the drop down windows..
I'm in agreement with LucyL on this. I've also sent a friend request to one of the users you listed as their ideas/views resonate strongly with me and my personal views - but, not everyone will agree with everyone all the time.