He did not mock him because he was disabled. As much work as Trump has done with disabled vets should make this obvious. This is ridiculous. This is a tempest in a tea pot. Trump will get past this on his way to the nomination.
Not disagreeing with your statement, but I hope you noticed my mention of the word "perceived" (twice). There is a world of difference of a disabled veteran (hero) and a disabled left wing slime reporter (vermin). The Donald and his handlers really need to get his temper in check or the implosion is going to happen quicker than later.
Sorry to say sometimes perception is more powerful than reality. The MSM has seized the narrative, and Trump now must ride it out.