The information available publicly shows that there was collusion. You may not agree with that, but it is perfecftly reasonable to argue that it does. Just admit that Brennan has not leaked anything and say you defend his credentials being yanked, anyway, for political reasons. It will be a lot easier for you because its the truth.
If he had done that, you might have a point. He did not. He picked one guy, in particular, and is threatening a list of specific people, all of whom have dared speak out against him. That is the ONLY thing they have in common.
You know, you ought to be thanking them for their service and for ringing the alarm bell, both about Russian interference having already occurred and the potential for it to occur again. That it is is more important to defend this one President -- no matter what he did -- at the expense of the truth about the risks posed then and in the future, shows just how short-sighted, selfish, immature, and unsophisticated Trump supporters can be.
It is decidely un-American and quite shameful.