The spawn village is there because it was in the seed, we literally spawned that close to it.
Take food from it, but replant it.
Trade with the villagers if you ever get emeralds, but there isn't a reason in the game to kill the villagers, destroy their houses cause you need wood or cobble, or any other the other random crap that happens to those guys.
If anything, treat it as a Fancy Mob grinder, as mobs go nuts trying to kill the villagers.