I will agree with you that no power on earth can PROVE what was in the guy’s mind at the moment he stepped on the opposing players leg.
But, it was very persuasive and this is what “judges” do............make judgments. In this case the “judges” are the NFL and apparently they believe he did it on purpose.
With his record, I agree that “most likely” he did do it purposefully.
I have big feet. Stepping backwards can sprain your ankle very quickly when you step on a tennis ball, much less someone else's shoe or leg. I have a permanent lump on the outside of my right ankle from doing just that, stepping on a tennis ball as I stepped backwards on the court, and it happened on more than one occasion in my years of park league tennis.
In a previous game Suh intentionally stomped an opposing player, but he took aim to do it. This was an accident which is being used for NFL PC foolishness.