"Donald Trump Says His Supporters Should 'Hit Back' At Protesters" Huffington Post
http://www.huffingtonpost.com/entry/donald-trump-protesters_us_56e2da10e4b0b25c918198c2

Re your link-for which I thank you-
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1) "Trump addressed an earlier event in Dayton, Ohio, when a protester tried to storm the stage"
***Trump made a punching motion-YEP and GOOD! 

2) "the candidate bemoaned the fact that there were no longer "consequences" to protesting and insisted the "country has to toughen up.""
***I am WITH HIM there, 100%!

3) "At a Las Vegas rally in late February, as a protester was again being removed from the premises, Trump lamented that "we're not allowed to punch back anymore" and reminisced about the halcyon "old days," when a protester would "be carried out on a stretcher.""
***I agree, yet once again.

Behave civilly and one will be treated civilly. 

Behave aggressively and one should be treated in kind.