I've seen a huge number of accusations that people espousing my views are shills in some thread here or on reddit. I'm sure there are paid shills, and even in large numbers. I'd bet it's a problem. But we have to be reeeeeeeeallly careful about throwing that label around.

When you're wrong, you shutting down discourse by effectively saying the other person isn't even a person. This gets us to far more extreme us-vs-them dynamics than otherwise possible.