First-person games are not about shooting
Ah, but now you're talking about first person
games and not first person
shooters. Analogously, not all side-scrollers are about shooting (e.g., platformers like Mario), but some of them
are (e.g., shooters like Contra).
I certainly agree that the first person perspective has potential for more than just shooting (and some games have been poking at the notion, like Deus Ex and Metroid Prime), but I do like me some good twitch shooter action.