That's f***king disgusting. And you wonder why people have a bad stereotype against gays. If you're having sex in public, you get what's coming, karma will bite you. You must be one of generic washed up nasty gays.
I don't think there's anything wrong with reopening it.
There was a shooting at my college town, it was hard for our community at the time and still is for many of us, but people still party there. Of course it's not the same anymore, but...
Tbh I would go, just to see what it is like. It's probably a bit morbid for some people but tbh I'm a bit used to being in places where people had died.