If you want an answer, take a step back and try to put yourself in the other side's shoes for a moment. Imagine that your side had won the popular election by nearly 3 million votes, and yet the electoral college had chosen to make the other guy president -- and that this was the second time just since 2000 the people had chosen your candidate and yet the election had gone the other way.
Now imagine that the guy who prevailed didn't try to reach across the aisle, but instead had enjoyed childish taunting of your side. For example, imagine he tweeted "Happy New Year to all, including to my many enemies and those who have fought me and lost so badly they just don't know what to do. Love!" Imagine that, unlike prior presidents, he hadn't tried to reach across the aisle to appoint prominent members of the defeated party to positions within his administration, to bring America together (like Obama did with Comey, Clinton with Cohen, etc.) Rather, he'd staffed up with the most extreme members of his own party, including radical media figures with no government experience.
Now imagine his staff has essentially declared war on reality, lying constantly and shameless -- inventing terrorist attacks that never happened, quoting obviously false stats about the murder, and so on.
Would you expect the rift to heal any time soon, if that were the case? No, me neither.
Keep in mind the rift didn't heal for eight long years with Obama in the White House, despite him being mild-mannered, polite, and extremely solicitous in seeking bipartisan action (e.g., adopting Romneycare wholesale). If even a president like Obama, who continually offered olive branches to the other side, couldn't heal the rift, how likely is it that a guy who delights in insulting and provoking his enemies, like Trump, is going to do it? Trump resembles nothing so much as an Internet Troll, who gets off on saying outrageous stuff just to piss people off.-
What exactly were you expecting when you made that puddle of Ebola-infested diarrhea president? That we'd all come together and start singing Kumbaya? I doubt it'll come down to another civil war, but that's no thanks to Trump, who is acting just the way you'd expect someone to act if he was hoping to bait the opposition into a Harper's Ferry raid. What's interesting isn't the strong opposition to Trump, but rather how incredibly peaceful it has managed to remain in the face of constant provocations.