Is Justin Ehrenhofer providing the Zcash community constructive criticism or is he being overtly negative / a troll? Below is a sample of his recent tweets about Zcash. Decide for yourself.
But Ehrenhofer aside, in my opinion, ZCAP / ZF should have a process in place, whether by petition or vote, to remove existing members of ZCAP whose presence does the community more harm than good. You could even have a supermajority requirement in place if you wanted to ensure removal was limited to the worst of the worst cases.