There's nothing new in people being obsessed, it happens all the time. Births, deaths, marriages, scandals, celebs, reality shows, royals, murders, the list is endless.
I haven't seen the Netflix programme but they are as entitled to feel how they feel as the next person. Just because you are rich, famous, royal, doesn't mean you don't get depressed, miserable, jealous, angry or whatever, they are just people feeling slighted like many before them.
If you don't care then don't watch. It really is that simple. If you watch and agree/disagree no-one cares anyway.
They are much like plenty of siblings, partners & in laws, other dysfunctional families on Mumsnet, only they get paid to air their feelings.