Well I haven't run this but here is my take.
1) If you kill the adds, no wipe, no problem
2) If you ignore the adds, sometimes they don't aggro, but sometimes they do, killing healers and causing a wipe
So why not just kill the adds and not worry about it? Sure, you can hope in a PUG you've got DPS smart enough to react if they aggro, but since when is hoping you're with smart people in a PUG a good policy? Better to just play it safe.