Because its marketed as a pve game. It's designed that way. They tacked on pvp and it feels that way.

Not for me I bought this game for the pvp

There is a zero chance you're serious. With all the pvp games actually done right, with custom games, map vote, large teams ,dedicated servers, why would you possibly pay for destiny and ttk just for the pvp? That's buying a sandwich and only eating the lettuce. There are better options cheaper.

You know, there are quite a few people who exclusively, or almost exclusively, play PVP. Just because you and I don't like it, doesn't mean other people don't. It's not affecting your experience, so what do you care?

It does affect pve players. The more they try to force players into pvp, the better the numbers look as far as player metrics go. Thus, they devote development time to adding pvp only things. Pvp is far easier and cheaper to design things for anyway. That's why Trials being introduced when it was saved/screwed destiny. PoE was a joke, people disliked it intensely and felt lied to about not getting a raid. Trials was a faster, more interesting way to get etheric light and better overall rewards, saved HoW from being a total flop, and gave devs a metric saying the player base plays pvp more than it actually would if people only played what they enjoy.