If the player was roleplaying that they were partnered with the rogue, and are willing to follow up on the RP (as in take the blame if they are caught, pay fines, whatever), then it is good RP. Rogues seem simple minded, and might easily be convinced to attack helpless crafters.
On the other hand, if it was done just to grieve, and no RP thought was given as to why a rogue would attack in a public place, then it is bad, and not RP at all. A rogue would not come out of his hiding on his own to invade buildings on the risk of being caught, killed, or imprisoned. Well, perhaps a -very- stupid one would.
This is a context issue.