In my opinion, to not buy something like Dawnguard for this one issue is... ignorant.
But to each his own...
You do know that some people don't start Skyrim MQ with certain character in order not to have the (already small) towns depopulated by random dragon attacks, right?
How many times on these forums the issue was brought forth asking Bethesda to make npc immortals when fighting other npcs/ creatures? To see the same mistake repeated, even worse, without a way to avoid it is... Unnerving at best.