There's no video that shows Crowder pushing the man on the ground. There's video of him getting up, but there's no evidence that Crowder was the reason the man was on the ground.
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I guess it doesn't matter that they were tearing down a tent with a permit to be there. Their argument is that the union guy was within his rights to take a swing at Crowder.

Look at it like this, lets say the union guy was raping a woman in the park and Crowder came up and pushed him off, in FeedMeNow world the rapist union guy would be within his rights to punch Crowder multiple times.

....and what about the union goons turning over tables in the tent with hot coffee on them and destroying a hot dog vendors cart yelling racial slurs at him and then cutting up the tent? The mere fact they're defending this stuff just shows you how far gone they are.