If you really want to support parents and families in your community, you should think about sending your own children to the nearest schools and getting involved in the PTA; setting up a youth club and applying to the council for funds (or raising the money yourselves); doing your shopping in the high street, using the local library, post office, park and swimming pool, travelling by bus or bike, going to church/temple/mosque/synagogue and walking round your 'hood, including your local council house estate, from time to time.
In that way you will get to know who is causing trouble and who isn't. You will also see that the vast majority of people are peaceful, law-abiding citizens.
However, if you live in a dangerous area, you could badger the council for a local community police officer to be attached to a school; you you could patrol in posses of grannies and grandads, you could ring the police when burglar alarms go off, you could report the fights you see and/or hear, you could hang around outside rowdy pubs at closing time and follow, at a distance, any drunken louts and report them to police.
To do all that though, you might need to work shorter hours and work closer to home. There is definitely a role for older, retired people here!
And this is just too important, imo, to leave to the politicians, who don't know anything about the local communities, and who while spouting about the 'Big Society' are doing the very things that undermine the efforts of local people to keep their communities together.