Defective, err... defecting Liberals

Joe Comuzzi has gone over to the Conservatives and the overall reaction from Liberals has been to say "good riddance" and remind everyone that this guy has run afoul of several Liberal leaders. It reminds me of the Liberal response to Wajid Khan or David Emerson departing the party. In both cases the MP was dismissed as a weak-willed, idiotic traitor (or however we say that in polite prose).

Fair enough, maybe all these guys are duds, but I have one question for the Liberal Party: How many more dubious members do you have to shed and why do you let them all get elected as MPs?