What would be wrong with another Brexit referendum?

I don't see how another Brexit referendum in the U.K. would be a betrayal of the British people. We know the Russians worked to influence people to vote for it. We know, because they said so themselves, that some people voted for it even though they didn't want it, as a protest vote, because they didn't think it would pass. They have had more time to learn about what it would really entail. It seems only fair to give people another chance if they have changed their mind.

Of course, if it fails on another vote, those who still support it will be mad, that's human nature. Losers tend to be mad even if it is a fair loss. That doesn't mean it would be unfair. It would be more unfair to cleave to the first referendum if the majority of people now don't want it.