jes a referendum with 52/48 percent is obvious, especially if the drunkards that voted there started to get fired some time later after the referendum because the factories they worked in started to close down.
A referendum with 52% of the vote means whichever side got 52% (in this case the Brexit side) won the referendum, and has prevailed.
I disagree with your conclusion that Brexit will cause much harm to the UK economy, but even if this was true, leaving the UK and having this harm is within its citizens rights.
The UK held subsequent elections after the Brexit referendum and the party whose platform is "Brexit" has won these elections.
I don't think a no deal is a good idea too, but if it must be done, then it must be done. You're right about the fact that having trade barriers does make trade harder and such -- I do hope that there are no barriers to trade, and the UK can be given its sovereignty back instead of the EU telling them what to do.
I think it would be okay if a hard Brexit is done so long as a new trade deal is done quickly, and this may be what it takes.