There is usually a good reason why a RINO like King is elected in these districts. It is because a conservative wouldnt have a shot. They are in a liberal district.
Get rid of King and all you do is reduce the number of Republicans that vote on the organization of the House. If the Dems pick up five or six more seats, we have Speaker Gephart, the Dems control the committees and decide what bills come up for votes and when. But if winning a primary to make you "feel better" offsets the disadvantage of losing the House and the country tilting left, well have at it. Dont let me stand in your way.
I am not sure how familiar you are with Peter King's district, but it is far from liberal and a democrat would not stand a chance in a general election. So in this case the winner of the Republican Primary would not "just make me feel better", we would all be better off.