Does anyone ever take justice into their own hands? Not recommending it, but my neighbor's car was stolen so I went out and found it for them that day. It was reported missing but I had a feeling it wasn't going to be actively looked for due to the severity of the crime.
For example, if you forced the car thieves out of the car, or parked it in place by blocking the road, you might be looking at assault charges.
Similar arguments can be said for most other common crimes.
Consider noise ordinances (harassing / threatening your neighbor until they shut up), trespassers (Threats? Forcibly move them?), burglaries (rob them back?), domestic violence (victims that kill the assailant are often charged with premeditated murder), etc.