What I'm seeing is minorities and people who care about human rights finally getting fed up with the status quo and at least trying to get people to talk about it. I'm sorry that makes people like you feel threatened.
Right, because nothing encourages open discussion more than blacklisting everyone you disagree with.
I don't think people's hearts are in the wrong place. I think most people try to do good. I also think that the behaviors in question are trading small short term good for catastrophicly massive long term harm.
Edit: Yes, also downvote people you disagree with. This will also encourage more open discussion.
In my experience, this is because people who agree with whatever the status-quo currently is erroneously believe their views to be "apolitical" while everything else is "political." Having views or opinions that are "political" is branded as bad by those in power since it threatens their control.
Judge ideas and actions based on their merit rather than whether they line up with current trends.