The chances that Internet will suddenly cease its existence are about the same as with the real world, so those arguments don't make much sense anyway

we could get A-bombed any moment, does this mean that we shouldn't make any friends at all? No. The same with Internet.
My point is simple: meeting people via Internet is not the same as with RL, but those are still people, and those people are real - and sometimes they are even nicer than people you meet face-to-face. There is something amazing in being able to communicate with someone living on the opposite side of the globe. I don't see anything bad in it.