What if, miracle of miracles, you and I disagree on what should or should not be censored? What if Twitter straight up abuses this power? Either way, the result may be fewer users, and this could hurt Twitter as a business.
If you think it's a poor business decision, that's your call, and time will tell. But it has precisely nothing to do with "freedom of speech."
https://en.wikipedia.org/wiki/Censorship_of_Twitter
http://www.newyorker.com/culture/cultural-comment/censoring-...
And so on.
[1] Why yes, this does actually happen. Harassment on the Internet is no joke. http://blog.unburntwitch.com/post/139084743809/why-i-just-dr...
I don't have a problem with Twitter "arbitrarily censor[ing] people with the wrong opinions." Its their platform and they don't have to give a voice to everyone who has one, they can do whatever they please and promote any agenda they want. That is their choice. If you don't like Twitter's rules you're free to start your own site, or write a book. Nobody is entitled to use someone else's site any way they wish.