Why don’t attackers stay at recently captured objectives?

Talking about operations here. Whenever I play and our team is pushing for say objective A, we will capture it and as soon as it has been captured, nearly everyone instantly runs away to B, but by the time B has been took, only 4 enemies have already came to A, took me and the one other guy defending out and recaptured it. Team then rushes to A to retake it but the enemies just do the same tactic to B. A big game of cat and mouse, repeat this sisyphean cycle until the batallion runs out of tickets. I had a game on Empires Edge recently (in the castle with three objectives) that had me screaming at the TV, idiots would take one flag then all of them would zerg rush the nearest one leading us to lose the one we just took.

All it takes is for a few defenders, not even four or five to stay behind for 2 minutes and operations would be much easier.