> What is the average age of a Kiwi Farms user?

KF itself has been around for nearly a decade, and some of their targets had been harassed by members of KF for years prior to founding a dedicated website. There might be kids on KF, but the average user is firmly in the adult demographic.

> I just don't understand the mentality of people to do this and not feel remorse.

It's a mentality of dehumanization: their targets, in their eyes, deserve less than the basic dignity we give to human beings. That capacity for dehumanization stems from years of indoctrination in reactionary communities.

I think for many people in communities like this, it's easy to just place the blame on the rest of the community. If dozens of people are participating, they don't think their actions count for much.

As for the people running the site, I don't know, they are just cruel.

One interesting metric I think might be rate of psychopathy of KF users, since a forum dedicated to discussing (read: mocking) people seems to me like it would naturally attract people who revel in schadenfreude.