its easier to make friends with the local chav population, then they get out the way, and they dont damage your car while you're in the house.
how do you make friends? all it takes is a 5 min chat, laugh about the naughty things you did as a lad, give them some advice on how to cause some trouble without getting caught, tell them about the time you seriously kicked the crap out of someone for no apparent reason, let them know you've got a few convictions and had a few run ins with the cops, then they know not to screw with you and they also think you're one of them. then you've not only avoided the hassle of starting a war you've also developed a contact on the other side so you can get info about "who done it" next time there is a problem. you're also last on the list of targets when they're bored and want to start some mischief.
i've only lived in my house since the beginning of may but i already know all the local chavs, and they give me the nod of resect when i drive past. it makes life so much easier. i dont worry about anything happening to my car, and i know if it does i'll have a good chance if finding out who is responsible.
there are 3 ways to get people to do what you want; fear, love and respect. choosing the most appropriate method for any situation is important. in this situation a combination of fear and respect is imo the best option because it minimises the risk or damage to you property. fear alone would work, but fear with a bit of respect is better, and also easier to achieve.