Brexit should be undone, because of illegal interventions and the EU should just forgive them for having a gullible population.

It's too late now. But there is a lesson for letting media lie to the people. It's difficult to put funding pressure on journalism at the moment, but that funding model where you produce a misinformed voting public needs to be illegal. Or at least individual stories that create a false impression need to attract a fine, and a enough retraction that people seeing the original story learn that it's false.