Yep...people like Rudy Guiliani, Bloomberg, Rick Perry, etc., etc. should never be allowed to be in the party. If they act like ‘rats...kick their asses out.
The ones who win elections, you mean.
That's a respectable point of view. Purify the Party, get down to the 20-25% core.
But be honest about what you are advocating. Your pure party will never win another election, as long as any of us live.
Most of us don't want that.