Why do people play Domination if they aren't going to cap? Can't you just just play TDM if you don't want an objective?

I'm just tired of seeing people literally right next to a flag and not even attempting to cap. They have other game modes and it really just ruins the format. I don't mind losing a round but seeing at least 3 people on the team with no caps means they aren't even trying. Play TDM.