Again you are missing the point. It really is irrelevant if Rossi kicked or Marquez touched his leg with his brake lever.
Rossi intently pushed another competing rider to the edge of the circuit and as a result, they made contact. That is irresponsible riding at best, and dangerous at worst.
Now, if you do want to debate the 'kick', it's interesting to watch that video you posted at 0.25 speed. It looks initially as though Marquez' helmet touches Rossi's leg, at which point you can clearly see Rossi's leg open outward are upward.
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Whether it was intentional to knock Marquez off is irrelevant. That action, combined with forcing him to the edge of the track, caused another rider to crash.
Riders get penalised for accidents all the time. If the criteria was "did they mean to do it?' then we would get a lot less penalties. It's the difference between murder and manslaugher. If I run you over in my car by accident, I'm still going to prison for Manslaughter. I just won't go to prison for as long as Murder if it were intentional.