To me at the root of everything in this article is SM. SM is what is damaging kids.
The fact that liberal girls are most affected to me is about nature rather than nurture. By their very nature they are going to be the group most affected/damaged by what goes on on SM as they are likely to be more sensitive then their conservative peers.
I find there's often this idea though that people learn to cope by dropping them into situations, like 'I was left to roam the streets from the age of 4 so I learnt how to look after myself and that I was in control'. Whereas IMO you can't force healthy independence on people, it comes when they're ready and some are ready way before others. Coping skills for all sorts of situations can be taught and learnt by watching others though of course. Kids learning by themselves out roaming around or from their peers or on SM also happens but may not be the coping mechanisms you'd hope for - eating disorders and self harm are all over SM, smoking, drinking, drugs, unsafe sex were are more likely with teens that were just hanging around even back 30 years ago.
Feeling victimised/marginalised and bonding over it has always been a thing, from punks to goths to emo's and now gender nonsense. But SM allows the bonding/pressure to spread much faster and further and deeper, it's much more intense, and there's no getting away from it. Before SM you could come home from school and escape, now it's 24/7.
.I think it's important for students to know what they can and can't cope with though, 30 years ago a friend of mine chose not to study Peter Schaffer's Equus because she didn't think she could cope with it, it was actually a bold move IMO as she then had to study a different book in her own time with support from the teacher where possible. The difference was she didn't say the book shouldn't be on the curriculum or no one should study it, she didn't organise a protest or think she needed to get it banned, she just quietly got on with doing what worked for her.
In conclusion I'd say that SM isn't suitable for under 18's and that sensitive girls are the most negatively affected by it. That we need to stop groups of emotionally riled up young people banning things and cancelling things and put a stop to the walking on eggshells around them - but allow them not to participate and to find their own suitable alternative if they are struggling to cope with a particular aspect.