If they are entirely on the up and up.
The nature of the attacks to your hypothesis strengthens my doubts re Oathkeepers. I question everything in today's times. Those who attack those who question is reminiscent of those who scream racism if you question Obama or Nazi if you question Israel.
BTW, try questioning Zionism on Oathkeepers. You can bash anything on the Oathkeeper site, just not Zionism. That is cause for pause.