No need to beware! Just be as careful as you would anywhere else.
There are problems everywhere, I just read of a problem in Kailua where a man went and smashed someones car windows with a bat. A couple of months ago somebody punched someone out in front of a restaurant in Waikiki. I think you have to use your better judgment and not put yourself in situations that might get you into trouble. I.e. staying out late all by yourself,
leaving valuables in your car in plain sight, walking all alone in a deserted area at night. It is unfortunate that people are still saying things like this about Makaha. This information is very much outdated. The city has cleared out all the homeless on the Waianae coastline and it is beautiful. When last I went there a few months ago, I saw families on the beach picnicking, fishing and really enjoying the beauty of the area. People that don't come to Makaha to visit are really missing out on one of the most beautiful parts of this island especially because it's outdated previous reputation is no longer true.