Nice logical fallacy there, I'll follow on, by your logic we should have more modes because it brings the community together.
(That was a joke)
I meant it splits the community in that there are people that will only play HC "dorritos is for noobz omg" or only play non-hc "hc is for camper snipers!!11".
It's a moot point though, since HC is not going anywhere.
I play both, I don't really care, I'll join whichever server is free.
Yeah, I agree with you here, DLC is a sneaky way to charge your customers again so that they can continue to play with everyone. DLC can be good/worth the price, but more often than not it isn't.
For the people that only play hardcore, I would bet most would leave the community and find a game that offered that style of gameplay instead of just getting used to normal mode. That adds more users that people like me, who play both modes, can play with at no extra cost, and in essence growing the community.