"You only need one bad apple to spoil a barrel!"

meaningless drivel - but you already know that..

Yet you can't stop digging your hole..

So for you, generalising from 6 out of 600,000 [a bloody huge barrel innit..]
is not too far off you saying..
"a shifty looking 'foreigner' asked me on the street for 20p,
therefore, all 'foreigners' are beggars, and probably thieves as well"...