I think that is because they are a subsidiary branch of the liberal democrat who know those people are wacko's and don't want the stigma that goes with that title.
The sooner that people realize that not all democrats agree with each other about everything and not all republicans agree with each other about everything, the better we all will be. Politics has become too tribal and we all have to take responsibility for that. I do it, we all do it. It's a cycle at this point. It won't be easy to break. It has gotten to a point where it doesn't matter who is wrong anymore. It's a war and if it's lies, people have chosen to fight on the lies.