> I feel bad for the people who dedicated significant time to helping others there.
Why? When they wrote those answers they (presumably) helped the people who asked questions at the time.
The fact that what they wrote won't (necessarily) continue indefinitely into the future doesn't diminish the value they provided in the past.
It was presumably a fun part of their life and they won't be able to look at it anymore.
I've written support software for my company (not really in my job description). If somebody makes the decision to throw it all away suddenly, that would be a slap in the face.
Multiply this by thousands of contributors.
Those profiles represent thousands of hours of invested time. Having them deleted from the internet means they've lost all of that accumulated work.
When I answer questions in a public forum, helping the person who asked the question is only about half of the value I expect to get from my contribution.