I don't recall what Levin said, but I criticized Cruz on this forum for indirectly trying to put the blame on Trump ("Earlier today over thirty people were arrested at one rally. And then tonight as violence broke out the rally was canceled altogether. Now, the responsibility for that lies with protesters who took violence into their own hands. But in any campaign responsibility starts at the top." [Cruz, Breitbart story] Though I'd favored Cruz over Trump, that in my opinion was the low point in Cruz's campaign.
Still, Trump's conduct toward his primary opponents was outrageous in many respects. If most of the Republicans who opposed him in the primaries had considered those offenses "unpardonable", though, Trump wouldn't have won the election. Be thankful that they aren't that vengeful, and can put the good of the country over personal animosity.
Adulate your loser heroes all you want but knock off pretending rational people agree with you.