Perks pretty much work like nukes. They aren't blocked by either attack or special blockers.
You think it'd be right to be able to parry 29 bullets fired from 10 metres away? Or hell, even just one? ;P
But sure, sure, let's pretend that realism doesn't matter. I don't think keepers need more defence, decent ones are damn hard or impossible to kill as it is. They need more damage, not godmore :P