It wasn't DL that removed the passenger; it was the pilot.

I don't know what I think about this issue. But either the pilot is in charge of the aircraft or (s)he isn't.

There are plenty of folks here who complain that pilots stuck in unending tarmac delays should take charge of the situation and do something about it instead of submitting to mindless bureaucrats. Here, a pilot was uncomfortable flying a passenger, who had made a false accusation against him, and used the authority granted to him rather than submitting to bureaucracy once again.

There's a lot here we don't know. Was the false accusation simply an honest mistake, a stupid joke, or a malicious attempt to smear the pilot? How was the passenger reacting to the outcome --- accepting the result, or continuing to smear the pilot further? That might make a big difference in how we view the justness of the result.