Anyone enfranchised can vote. Democracy requires that the outcome is respected.
Whether the outcome is positive or negative depends upon the respective person's viewpoint.
No one would conclude the rise of Nazi Germany was a good outcome.

Decisions made by Democratically elected governments are not always good ones.

The Iraqi war was based on mythical weapons of mass destruction, thanks to Blair. THe events surrounding the mysterious death of Dr Kelly tar the labour government of the time with a rather unsavoury brush.

A leaked report from the OPCW tells a very different story to the one given for public consumption concerning the gassing at Douma and justification for the subsequent bombing campaign in Syria.

The 2016 referendum result has still to be implemented because of deliberate stalling by the elected government in direct opposition to the mandate of the people.

It is obvious that democracy has flaws. As yet nothing better has been found as a substitute. Many posting here make it very clear they would blatantly ignore the vote if the outcome did not suit their expectations. A very scary precedent they are advocating! They show the same contempt for the electorate as Parliament. Hence the rise of Brexit.
The majority will prevail - Get used to it!