[Malician]

You make a good point with your last paragraph: given the circumstances, if we held a vote on who should get to vote, the answer would not be one millenials would relish. Those calling for disenfranchisement of the elderly are not only morally wrong but would bring down the very system which protects young people.

I do think that it is possible for a reasonable person to call certain decisions bad, even if it's not entirely objective. The vast majority of the credentialed economic establishment believes that Brexit was a tragedy, so does the stock market, and so do most of those educated on international political relations who study the subject.

Of course, the rejection of the establishment by voters who are tired of having their will systematically ignored, mocked, and thwarted is the reason for Brexit, so for the Leave crowd that isn't much of a point.