Why do you leave games?

Hi,

I`ve noticed lately, that during almost every match i play, the other team leaves as soon we have captured the objective, or we get a chopper gunner in the air and the likes.

My question is, why do you leave?
Is it because of lag?
Is it because you want objective matches to be team-deatchmatch?
Is it because of the hard resistance?
Is it because you dont want to get hacked to pieces by killstreaks?

I just dont understand why, if you meet some resitance in any way, then man up, change tactics, and atleast make an effort, dont just ***** out.
One match yesterday we actually went through 6 differerent teams in one match....( HQ)

I mostly play Hardcore, usually Snd or HQ. I always play with a standard team of friends, and we always go for the objective/win, our main strategy is mapcontroll/ objective area controll.

Im currently on a 329 winstreak so that people leaves just keeps that one going, but come on?

Also, on a sidenote, spawnrushers: Why do you rush the other teams spawn? its just plain stupid, because then you change the enemy spawn, usually behind your team, and thus get them killed, instead of trying to controll the map...