Lets say Trump was unaware of any meddling amd there was no direct collusion as he insists there wasnt. He still has his monumental ego to protect - he is so insecure he wants to ignore the mounting evidence as he feels it delegitimises his presidency.
What people, including you, seem to miss is that the Russians were just as surprised by Trump’s victory as Hillary. The Russian objective was not to get Trump elected. The objective was to pit one side against the other in American politics.
The Russians funded pro-Trump rallies. The Russians funded pro-Hillary rallies. The Russians put memes into play against both candidates. The Russians tried to hack both campaigns emails, succeeding with the Democrats (which became presumably WikiLeaks).
If Clinton had won half the population would have felt she was a crook and not entitled to support. If Trump won, ditto. End result, the American presidency is weakened which benefits Russia.
So Russia didn’t win the election for Trump or lose it for Hillary. [1]. What they did was undermine whoever did win.
[1] Comey might have through.