Pro, I don't have a real problem with stickers, and some are tastefully done. But I won't put stickers on my vehicles. Not that I think it's likely, or is it my reasoning for no stickers on my vehicle (I think no stickers or factory badges or trim looks cleaner) but an educated thief could see the stickers as advertising what's inside.
It's the same as plastering performance parts stickers all over your truck. I have piles of stickers and they will never be on my truck. No one needs to know which parts may be in it.
But keep in mind my rant is biased, because in my area every hillbilly has their life story (political affiliation, hobbies, favorite sports teams, favorite brands, lost family or friends, and even preference in women) on the back glass of their vehicle.