It was a Red card, dangerous tackle in modern football (maybe not back in the 80's/90's where you just had to get the ball first). Extremely shocked when VAR didn't take further action. He knew exactly what he was doing, trying to make an early statement that they were in a battle, old fashioned defender 'putting something on them early'. However, I don't believe he did it with the intention of snapping a leg which could easily have happened.
It was stupid in more ways than risking a potential Red card. He was easily clearing that ball normally and in doing what he did, put us immediately back under pressure with a dangerous free kick at goal. Players should know by now that you simply cannot follow through a tackle, studs up with your entire body off the ground.
Obviously, it's weird world we live in where people think it's OK to threaten death on somebody that makes an error of judgement or a bad tackle in a game of football, that realistically, should have zero impact on any sane person, regardless of who you support. People are unhinged.