Kick/Rajaplus Composite

The organizers behind the wrestling match that saw Quinton "Rampage" Jackson 's son Raja brutally pound his unconscious opponent, Syko Stu , have condemned his actions as a "selfish, irresponsible act of violence."

The Los Angeles-based wrestling company, KnokX Pro Entertainment & Academy , tore Raja to shreds in a social media post Sunday, adding ... "This egregious act is reprehensible and never should have occurred."

They went on ... "In the 17 years of operation of KnokX Pro Wrestling Academy, there has never been anything as heinous take place such as this and we apologize to our patrons and fans."

They also said they are monitoring Syko's -- real name Stuart Smith -- well-being.

We reported the mind-boggling news ... Raja pummeled an unres

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