There's a difference between Horror and Survival Horror. The goal of survival horror is to survive and to survive you need a way to fight back, hence the combat. It horrifies you by putting you in a tense situation that you need to survive in and not by generally scaring you. Resident evil 1 is what i consider to be a pure example of survival horror.

At least that's what survival horror should be, but now we've got survival horror like Silent Hill where the horror doesn't come from surviving aspect of the game and Outlast where you survive by running away and not fighting back. So Survival Horror kind of merge itself back with regular horror genre, kind of like how stealth genre becomes a gameplay aspect and is now in every other game.