Well, they're easy enough to avoid. The lore of such games as The Last of Us and Dying Light are centered on a world ravaged by a zombie/viral apocalypse, so of course there are going to be zombies/infected creatures as one of the main enemies to defeat. Then there are games that really don't have anything to do with zombies, but include a gamemode or DLC/expansion that centers around killing zombies. Why? People like mowing down hordes of zombies because it's mindless fun. I would say Call of Duty: World at War's Nazi Zombie Mode really helped popularize the whole "unrelated non-zombie game including a zombie mode" craze.
I never really got into these endless zombie horde game modes, but I enjoy the occasional zombie game. There are some franchises/games that do it well such as The Last of Us, Dying Light, and Resident Evil. I find appeal in such games beyond "oh look there's a bunch of zombies to kill", whether it be because of the narrative, survival elements, or whatever else.
At any rate, there are so many games out there to play that it's not worth the trouble to worry about all the games that don't appeal to you for whatever reason.
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