Get to know them and offer to do chores for them. Smile and wave, call them by name and sir or ma'am.
Yes sir; there's nothing like knowing that there's a friendly neighbor who'll call the police and help stop the bleeding after you've been robbed and left bleeing on the floor.
Make sure you treat them with the same dignity and respect everyone deserves.
Yep ... there's nothiing like feeling dignifed and respected while you're being mubbed and/or robbed.
Arm them with guns and teach them how to use them safely.