Whilst Iran and KSA may be both guilty in proxy wars, Iran is a neigbour and KSA is not.
So you think that a family who come from Najd who were robbers and looters and would not hesistate to massacre other Muslims who did not agree with their views have legitimate claim from the Islamic point to govern Hejaz? (I know that all Muslims countries have accepted this and recognized this, but from the Islamic P.O.V, is thie rule over Hejaz valid?)
If so, then tomorrow bloody ISIS will be considered legitimate!!