These are often also simply hard clients.
Jones is a good example of this. He cycled through about 20 different lawyers during the sandyhook trials. The reason he was defaulted is because when he was required to produce something, he fire the lawyers (or they'd quit), hire new ones, and invariably in the depositions an answer to "did you bring this document the court mandated that you produce" the answer was "oh, sorry, I'm brand new to this case and didn't know anything about that".
Jones wasn't cooperating with his lawyers.
There are plenty of good lawyers that have no problem representing far right figures. The issue really comes down to those figures being willing to follow their lawyer's advice.
The really bad lawyers simply don't care if their clients ignore their advice.