That's how "norms" work, though. It is almost certain that at least one candidate has been cheated out of the presidency, but he chose to not fight so soon after the civil war, to avoid enflaming tensions.

Nothing is official-official until December 13, so he has the right to pursue whatever remedies he wishes in the meantime, but the lack of trust he is fomenting right now, today, is harmful to America, and that's running counter to long-established norms.

No one has produced any evidence. Allegations aren't evidence.

> If there is evidence of election fraud surely it is in more than Trump's interest to find out about it

The reason his cases keep getting dismissed is there isn't any evidence of election fraud.