Jeez Louise- first it was "omg she was in a bad area" and now it's "every area should be considered bad in this day and age".
Violent crime has decreased sharply in the US over the last 25 years:
5 facts about crime in the U.S.
we just live in a hyper-connected world with 24 hours news vying for eyeballs and sites like this that chronicle every heinous act in the US and beyond.
Most violent acts like rape and murder are committed by someone the victim knows (see here, from 2012 but more recent data shows this holds true) "
https://www.bjs.gov/content/pub/pdf/vvcs9310.pdf
We see a lot of stranger crimes on this board and in the news because they are the most unusual and attention-grabbing, and there's probably a bunch of psychological reasons for this (if it's random it could happen to anyone, if it's random maybe something can be learned from it on how to protect yourself so it doesn't happen to you, etc.)
That said, gang violence *is* a huge problem in very small specific areas throughout the US (I live and work in one of these areas and have worked with young incarcerated gang members). But almost all gang-related murders are between people known to each other. Doesn't make it any less tragic, but there it is. Yes, it's true innocent people get caught in stray gunfire, yes gang members might steal a car/burglarize/assault someone. But these weird gang initiation stories and and reflexively blaming gangs for murders of innocent strangers- the statistics just don't bear this out. These stories when they do happen get an outsize amount of coverage, but it's just not that common. Gang members killing each other ? Sadly that happens with some regularity. Gang members killing random people? Not nearly as often as intimate partners. family members, "friends" etc.
I think that it's possible a stranger killed Kathleen and lit her on fire to hide DNA. I guess it's also possible that this was a car-jacking gone terribly wrong. But gang initiation is waaaaaay down the list of possible scenarios based on statistics alone.