This is one of the main issues with the internet. Anonymity can be liberating, protective, useful, but it can also be extremely dangerous if abused by the people who want to exploit others.
I'm not one to blame the victims, however, people should really, really get it into their heads that you can't trust everyone, or rather, anyone on the internet. Being naive is not a crime, but it's also not a virtue in these times, specially when talking about the stuff we talk about here. There's a very good reason why even outside of the internet most people tend to be wary of strangers.
There are many vulnerable people here and I'm very surprised that the partners megathread is still a thing. I personally avoid it like the plague specifically because these tragedies are so common on the internet, but still very rare in this place and many people have found comfort in a partner that they found there.
Also, I'm sure that the usual assholes will turn this tragedy into ammunition for their ridiculous agendas.