Blame God for the disaster?

Many of my friends in Facebook are religious.  They have no problem proclaiming their belief in God or Jesus.  It is frankly tiresome for me.  When something great or good happens to their life, they "thank" the Lord or Jesus or God.  With the belief that the good fortune was bestowed to them by their deity.  But if something horrible or bad happens, they are all mutes.  Well if their deity truly is omnipotent and the source of all that happens, why don't they attribute natural disasters to their deity as well?  None of them blame their deity for these horrible things happening to good people.  Because this God or Jesus thing as being the source of everything is NOT true.  They know it but are just too blinded to acknowledge.