To steal their boat and savings? Real smart.

To quote Blackadder

Blackadder: Sir, these are not the days of Alfred the Great. You can't just lop someone's head off and blame it on the Vikings.

George: Can't I, by God!

Blackadder: No.
in other words, if you kill someone these days and then go trying to take their stuff,and think no one will suspect, you must be ******ed.