That is a strawman. No one is arguing that. We are seeking solutions, not assigning blame. We are trying to find a way to avoid just throwing these people in the junk pile.
I have nothing against a solution, I just don't think there is one.
For the elderly there are some solutions that tackle isolation. For young people there are bars, dating sites, meetup groups, college, church etc etc. If you can't make that work I don't think there really is a tangible solution beyond accepting your situation, and making the best of it. But many of these people likely don't have the mental wherewithal to just accept it.
Bars? You realize these days the majority of people are non-drinkers?
Church? Once again, not an option for a lot of people.
Dating sites? If you've got the looks. And even then they're about extracting money, not about actually finding people. A dating site that actually works well loses it's customer base.
College is good for those at that age, useless for those who have already graduated. And at least when I was in college some fields were highly skewed.
I do agree there are things like meetup groups. I think that's probably one of the better things for them that has come along.
And you're still blaming: "don't have the mental wherewithal".
So you're suggesting that someone create a mythical, catch all solution that caters exactly to those with social problems. That'd be the internet and why there are incel groups.
Seriously, this isn't that difficult of a problem. The world offers you options to meet people. If you can't make those options work there's nothing anyone can do for you.