It is very annoying but that is what cod has become, I really enjoy playing KC but sometimes when you watch a team mate run past a tag sometimes 2 you do have to wonder why they bother. It is the same in domination. I thought it would be better on ps4 as probably not as many shouty screaming kids but alas I was wrong.
People say play in a party but that is not always practical.
There is nothing you can do about as you cannot tell people how to play the game they will just do their own thing and for many that is camping tags or flags to increase their precious kdr.
If kdr along with a few other stats was removed from the game people would worry less and maybe play objectives etc making the game a much better experience.