Why are some criminals really stupid?

Burglar alarm goes off on a drugstore. i am close-by and respond. i am first on the scene. i first noticed the stores two front doors slightly open. i see activity inside. i open the stores front door and apprehend a male stealing narcotics from the pharmacy. i order him from behind the counter with his hands up. i notice a pair of socks on his hands. one sock has a big hole in it, around the fingertips area. he is arrested. suspects fingerprints are located on many items in the narcotics area of the pharmacy. he pleads guilty in court and sentenced 5 to 10 years. my question is this: out of all the socks this man owned, why did he pick a pair that had holes in them? surely, he could not have been that stupid! i asked him this question and he stated “i was in a hurry and grabbed two socks in the dark”. was this burglar really that dumb or was he just not thinking clearly?