In this statement, you are unilaterally making a rule as to what ideals are OK to hold as part of "civilized society", and where the boundary is. Stating your society is more "civilized" than another is an opinion in and of itself, and arguably those who hold views opposite yours likely think your societal views also contain hints of barbarism or offend human nature.
There are multiple ethical views that humanity and even this culture have held throughout the past century alone that the predominant society has now decided are reprehensible, that other nations consider reprehensible, and then there are also views that have been considered reprehensible now widely accepted by this culture.
Personally, my beef is not with whether or not people agree or disagree with these views; the argument in this subthread is external to my original message:
I'm tired of the Valley's progressive ideology consistently espousing acceptance, free organization, and free speech when we as an industry keep taking steps that seem against it when we disagree with the information provided. It is the message of social media: people should be able to communicate and unite worldwide. If we aren't radically upholding this belief, then we need to change the mantra to be aligned to what it actually means: associate with us, our ideas, and our worldview, and we will give you a voice. If you don't, your voice on this platform will be stripped, even if you are not engaged in attacking those that disagree with you.
I don't agree. "Kill all the X" is a hate speech and, depending on context, a threat of violence -- we already have tools/laws to act against such, so there's no need for more censorship.
Why not? If we silence them on few webpages, you think they simply will disappear? Trump as a president should be the wakeup call for everyone that forced, artificial politeness and political correctness won't make problems disappear.
Does it make any sense to push the fringe away and offline when we can let them expose themselves and then monitor them?
I can't speak to the particular accounts banned by Twitter, but the alt right have a carefully developed vocabulary designed explicitly to sneak across that boundary.