The onus of healing is upon the nominee, not the folks that are/were against him. As long as Trump and the Trumpite fanatics keep bashing his former opponents, they will continue to be #NeverTrump. Trump, to win 270 electoral votes will need all the support he can muster. He might be even or slightly ahead of Hillary in the polls, but he trails Bernie by a bunch. Where he is ahead, he doesn't get 50%. Even then, he has a long road to hoe with the conservative side of the spectrum. As he gears up to run against Hillary or Bernie, he seems to be moving even further to the left on most of his issues. So much for healing.
The onus for reaching out is on the nominee, but it is not his job to kiss all the boo-boos of those who bear him unreasoning hatred. This site seems to have drawn a large number of the "take my ball and go home" types, as well as the "God told me not to vote for Trump" crew. That's unfortunate, but luckily most of the country is more mature and open to reason. As was said before, his reaching out to the NeverTrumps is the right thing to do...but he can't make these folks do the right thing themselves. All he can do is offer them the opportunity, and he is doing that quite diligently.
Some will strive to give Hillary the keys to the White House no matter what Mr. Trump says. But the good news is, across the nation, Republicans and conservatives are now rallying to the Trump standard...his support has moved closer to the more traditional 80% plus range among Republicans and momentum is strongly in his favor. Evangelical leaders and solid conservatives like Paul Ryan will be right there next to him on the stage and that will take party unity to a new level as well.
The true elites like the Bush's and Romneys and some of their "offended ilk" (NeverTrumps), will never come around. So be it, let them run off and be Hillary supporters. Fortunately, it seems clear that the vast majority of Republicans/Conservatives are waking up and are going to vote Trump, and that very well may be enough to win this election because...thank God...Trump does very well with Independents and Reagan Dems. A coalition of Reagan Dems, Right leaning Independents, and 80+ percent of Republicans is a real force to reckon with.
As conservatives and strong Republicans, many of us are saddened to see some of our brethren willing to cut off their nose to spite their face. But we cannot bring reason to their unreason, nor common sense to their confusion...that is not our burden nor is it Trump's. All /hewe can do is continue to offer those things, common sense and reason, and hope they can break through the veneer of anger and hurt feelings that has put blinders on these folks.
I mean really, when you're throwing around Hitlerian terms and comparing the nominee to Stalin and Mussolini...you've simply lost all credibility and claim to rationality.
Lastly, it takes two to tango when it comes to rift healing. Mr Trump has asked them to dance, if they refuse than the burden of being a wallflower rests with them.