I actually found it kind of endearing... the robot's really cute too! =D
I normally don't like the idea of "Robot goes crazy and starts killing people", but when you really think about, did he even go crazy at all? Blinky only ever did what he was told. It's hinted that the rain might have damaged him somehow, but I don't think that was enough by itself.
The moral of the story is, if you tell your robot to kill everyone, don't forget to do a factory reset, not just a plain one =p
(Actually, this does kind of remind me of something unrelated, during the Cold War, the Czechslovakians painted a bunch of military installations bright pink and yellow - they reasoned the enemy wouldn't try to destroy cute stuff! There's your fun fact for today! =) )