If you ignore everything about how our electoral system works.
You had the choice of putting your vote next to any manifesto. 84% of voters put their vote for a party that said they respected the outcome of the referendum and would leave the EU.
You can spin that anyway you like - "this election was more about stopping X to me than Brexit", or "this election was not about Brexit", or "the Lib Dems/Greens/SNP/Plaid/etc suck so I didn't vote for them" or however you like.
But you had the strength of feeling that Leave voters have, you would have decided to punish the big two and put down some pro-EU protest vote, like how many put down UKIP as an anti-EU protest vote in the past.
And indeed in Scotland, where you had a strong nationalist pro-EU party, you saw them getting kicked in the teeth this election. Every constituency in Scotland you had a viable pro-EU voice, and folks decided in quite a lot of those constituencies that there was something more important to them than Brexit.
I actually think that the LD policy of a referendum on the final deal *harmed* us this election. We shouldn't have done it, and we only did it because we thought we'd not have to face a GE so soon, before Brexit had impacted the economy.
So again, why on Earth does anyone still think Brexit could be overturned, or there's secretly a majority of British people that want it to be overturned, or that any government would be able to get away with overturning it without being routed from office?
There's no evidence for this.
My point still stands - if folks had strongly cared about this, they would have voted for pro-EU parties. They did not. By-and-large, pro-EU voters chose instead to vote for Corbyn in England (it was a bit more complex elsewhere). Because it was acceptable that it was a Leave manifesto because of there being, in their opinion, more important things to worry about.
The notion of "credible choice" is fiction. You spend your vote how you see fit, and nobody is sitting there in the ballot box telling you "oh, so-and-so is a wasted vote".
Folks made their decisions. By doing so en masse, the voters of this country voted decisively for parties of Leave.