Police in nothing-better-to-do shocker

Last night i cam across a huge group of cops busting people getting off a bus in camden,
there was about 25+ with all but 5 of them just standing around.
They were harrasing some poor mum with her kid and lots of groceries
who probably just had her hands to full to swipe the damn card.

^^ erm how does that make them any money though?
Its like where I live in the well known Ghetto that is East Finchley. At least once a month the police mount this massive operation at the station in evening rush hour where they double check every ones travel card and generally hassle innocent people. There are usually upwards of about 10 of them carrying out this essential procedure. It really is unbelievable