Can’t they be deleted publicly but still visible for just the OP? (If they have to be deleted.)
Then the OP can still see all the helpful comments and not just have the rug pulled out from under them suddenly when they’re already struggling with thoughts of suicide?
Maybe being able to see a few people saying helpful things like “I’ve been where you are and here is what I did to get better...” will help? It’s a small chance but isn’t it worth it?