Protest walk against arms fairs

Hello I WENT TO A PROTEST WALK AGAINST THE ARMS FAIR THAT WAS HAPPENING AT THE EDXCEL CENTRE we walked about 2 hours from Stratford station was good turn out a few different groups WERE there the weather was not so good unfortunately i was surprised about so many police being there I THOUGHT THERE JOB IS TO ARREST THE REAL CRIMINALS SELLING WEAPONS. i hope to stay involved with this to much money is being spent on wars and military weapons when it could be spent on the things that really matter affordable homes infrastructure and education