The former president's son, 44, said Salvador Ramos would have killed people anyway with a "bat or a bomb or some sort of improvised device or a machete," after the killer shot down 19 school children and two teachers with an AR-15 rifle.
Speaking on Rumble, Trump took issue with remarks by Ramos' mother Adriana Reyes aka Martinez who said after the massacre: "He had his reasons for doing what he did and please don't judge him."
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Trump said: "He has reasons for killing 19 fourth graders? He had his reasons? Maybe you're the reason."
"We're not supposed to judge this piece of c*** who shot and killed 19 kids, he had his reasons, right? Screw you."
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"This is so much of the problem in our society, there's always an excuse, there's no accountability ever."
Trump then claimed people are not allowed to say what the real cause of school shootings are, with people instead of blaming guns.
He said: "We're not allowed to actually say anything about it. We all know if you actually see something and say something, you're labeled, you're bigoted, 'I can't believe you'd do that', maybe you misgendered the person.
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"They'll go after you for hate crimes, you'll get sued for stating the obvious. You're not allowed to actually say something, you're supposed to but we all know how it really works right."
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"'It's the gun, it's not the sociopath wielding it, folks. If it wasn't for the gun, this kid would be a well-adjusted, reasonable individual, he'd be a wonderful human being, right?'"
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"He wouldn't have done the exact same thing with a bat or a bomb or some sort of improvised device or a machete, 'he's a great kid, don't judge him.'"
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Ramos reportedly had a strained relationship with his mother - something she rejects - and lived at his grandmother Celia Martinez Gonzalez's home when he went on the rampage on Tuesday.
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In fact, Gonzalez was his first victim, when he shot her in the face before stealing her car and driving to Robb Elementary School, where he crashed, then ran inside, barricading himself inside a classroom and shooting dead the 19 children and two teachers.
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Trump said: "We have to pretend that even the biggest psychos are great through fear of reprisal, through fear of the lawsuits, through fear of being stigmatized, and malign ourselves for stating those things and calling out the obvious."
"Enough is enough. We have been coddled for too long, we teach to the lowest common denominator, failing anyone who ever had a chance beyond that."