I don't understand the concept of a simple majority being considered sufficient to decide on a national action of this gravity. Especially if it is barely any majority and more of a draw between the stay and leave camp. Would've expected something like a required 2/3 winning margin on this
On the other hand, you can't/shouldn't show bias like that.
E.g. You could make it 33.333% or less of the vote we remain.
> 33.333% of the vote we leave.
So >50% = Leaving, is then showing no bias.
tl;dr
If the vote needed to be >= 2/3 for a winning majority. Who gets to choose which way the options are set out.
I.e. >= 2/3 Leave
Or
>= 2/3 Remain
tl;dr (second)
You could present the question as "Do you want to Remain in the EU ?"
Or
"Do you want to Leave the EU ?"
So if it was >=2/3 of the votes, to be carried through.
Who gets to decide which way round the question is set ?
I understand your concerns. But perceive 50% as being the correct/fair threshold.
On the other hand a higher threshold, would give a degree of hysteresis and/or safety margin, stability.
Another way of looking at it, is if 65% want to LEAVE and only 35% want to remain. It seems rather UNFAIR if the threshold was 2/3, so 65% < 66.66666%, so we would have to STAY, which would upset the majority (Leave supporters).