Disregard for the non-observant is the opposite of the kind of solidarity we need now. Casting them into the wilderness, now populated by tiki-torch wielding ethnonationalist thugs, is not helping. It is, in the most basic formulation, bad for the Jews.
If you’re worried about hail victory salutes in DC and swastikas in parks and on subways (as we should be), start asking not whom you should disallow, but whom you should invite into your life.