Well, it has been sometime since some people abuse of their (probably) triggered lag. Usually it's not much of a problem, because either they leave or they are kicked by their own team, but sometimes neither of that happen. This enemys can be very dangerous, not because they are killing spree players, but because they are way too distracting (and as already being said in other threads, that modify the way the netcode behaves), especially in Demo and TC.
So I think it's only fair for heavy laggers can be kicked by the enemy team, or even better, they should be automatically kicked after some threshold time (maybe 30segs ?)
Yeah, they may love the game, but they ruin the game for everyone else.