Of course, especially in forums like this, it's always better not to give any personal information to strangers but at the same time let's also try to be real: kidnapping someone is a serious crime, if someone does something like that it's because they know that person has a lot of money, so someone in that position should always be careful. I don't think someone would blindly kidnap the average Joe to steal $2k of BTC.
People can do anything when the greed hits them and thus staying safe on the internet needs a lot of practice and maturity. Dealing with strangers should be done in public places with backup people nearby, or should not be done at all.
Many users of this forum have dealt in public and have got to known each other well. But there will always be bad eggs here and there and you cant depend on your luck to save you everytime.
On the internet, assume nobody to be your friend. Be discreet about your money and you should be safe.