The type of blackballing practiced by this campaign is similar to the kind of blackballing that ousted Brendan Eich. It is also a slippery slope.
Slippery slopes are dangerous. At each step of the way, you can reason about your present decision and easily justify it. Add all the steps and the picture is suddenly not so pretty. That is where the parent comment author aimed its reasoning.
You can only reason about slippery slopes by taking the long view; seeing where the slope leads to. Your comment takes the short view.