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Omar Mateen's father is now saying Pulse nightclub should share the blame for his son's massacre of 49 innocent people.

Seddique Mateen made that unbelievable statement after inviting reporters to his home in Port St. Lucie, FL. He believes the club was woefully unprepared for the number of patrons it had that night.

His gall is breathtaking, but watch ... he actually tries to justify his comment during the interview with Orlando's FOX35.

A spokesman for Pulse tells TMZ, "We simply can't find the words to respond to such a callous comment from the father of the man who perpetrated this heinous act."