I can relate to every thief player here. There's been time's where people were really asking to have themselves thrown into a snake pit for their robberies, but that was years ago. Ever since I've returned to the game three years ago, I've seen the thief folk being nothing but decent. Yet I've witnessed a LOT of aggression and unwaranted aggression at that, as soon as there was the slightest suspicion about being a thief.
I wonder where this 'death means nothing' attitude comes from. For me, a death usually means limping for three to four OOC weeks... it's driving me nuts. Besides, heck, you just _died_, take it serious please. A miracle that brought you back to life, nothing to shrug of for your char, but actually the greatest thing there is.
As for how people treat thieves, depends entirely on the faction, but for most factions the death priest should be the bigger offense, always. Some factions might just shrug off the thief entirely, others might go like "REPENT YOUR SINS" on a rogue, most people might just be wary about them.
I mean, even if a rogue is way less a criminal then a death priest, people will not like them. Why should they?
At the end, as usually, it boils down to play the game with people instead of against them. Something that seems very easy to forget, sadly :/