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the 50ish% of the population who who support it.
Is it though?
People have died.
People have reached voting age.
People have found the brexit on offer to be at odds with what they thought they were voting for.
Some voted to stick it to the man rather than actually vote to leave.Even just looking at the original 52%, a significant number are remainers now, and a lot of the rest aren't "leave at any cost".
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Is it though?
1) We can't know the number without another referendum, so we can only go by that at this point.
2) And if we did, then okay: 45%. Or 40%. Or 35%. But at what point do you find it reasonable to dismiss the results of the referendum and the n% of people both democratically and emotionally invested in it?
3) And if you are correct and the majority has diminished (and I hope it has), then this is more reason (from a remainers perspective) for a second referendum, not less.
re:libdems
There are also a lot of people (in London and elsewhere) who, despite being opposed to Brexit, wouldn't vote for a party that has no concern/policy for the 50ish% of the population who who support it.
As andyp says, a second referendum may be problematic in a representative democracy, but at least it can be pitched as a followup referendum with actual informed options being proposed. Just ignoring the referendum (even if legally legitimate) seems imprudent to me.