Misinterpretation, maybe?

There are 'comic'? cartoon characters of almost everything official around here. I imagine someone very high up in the scheme of things went on his pilgrimage to Disneyland and heard of the police being referred to as 'pigs.' He must have thought that this was a great idea, since pigs are universally regarded as lucky (as well as tasty) and must be a really non-threatening image for people. (I might have got this wrong, of course, but I simply can't think of another reason why the police should represent themselves like this otherwise.)