Pannonian, please remember that their parents of the shooter also lost their child - probably in a more complete way than other people, as they not only lost the life of their son but also the memory of their son as what is left to them is the fact that their child murdered 30+ people, the more or less open accusation that they as parents are at least to some degree also guilty of what happened and probably also their own feeling that they are at least partly responsible because they should have done something different to prevent this tragedy from happening.

Unless you have a very good reason to believe that these parents are somehow also responsible for what happened, they have IMHO the sme right of privacy as any other parents who lost their children in this shooting. Your "tough cheese" comment seems quite inappropriate here
(NB: this is not a comment in my function as Backroom moderator, but my opinion as an Backroom-patron)