If you give a mouse a cookie...
...are you legally responsible if he starts an accident riding his bike while eating the cookie?
Or if you give a mouse a cookie, he starts an accident and then leaves the scene?
How about if you give a mouse a cookie, he starts an accident and then leaves the scene, he's not wearing a helmet but listens to music through a headset, steals a bike someone disabled the brakes on, but since he's riding against motor vehicle traffic runs over an elderly lady who is NOT wearing a helmet despite the fact that she falls and hits her head more often that the average cyclist?
(The mouse couldn't make the elderly lady drop the dynamite she was carrying, causing a railway weigh scale to tip over and hit a frightened train passenger, so I won't get that farfetched--but it could happen.)