Ah I see why you'd think that... I'll go in to more detail if you can be arsed reading this late!
No, not quite. If I thought the issue was remotely reasonable, then vetoing it would be a tittish move, to put it bluntly. That would be akin to dictatorship. That's why we have manifestos and mandates at the end of the day, because you put your ideas to the public, then you work to implement them.
It's just on this issue; it is so important that it supercedes popular opinion and should be judged on more logical grounds by those responsible for acting in the best interests of the country, particularly the chance of massive economic self-harm that could linger for decades.
Let's face it, if we left all decisions to the populace, then you'd have some totally unrealistic policies come into law that would be disastrous for the country, because populist actions like massive tax cuts and so on would be voted on because nobody really gives a toss about thinking about the long term consequences. It's up to parliament to understand we can't just throw free money at everyone and everything, because it isn't a bottomless well.
Speaking of manifestos, they are never implemented in full, because ideas become unworkable. For example, look at the British Bill of Rights from the Tory 2015 manifesto. Like Brexit, you could argue the populace voted for that to be implemented no matter what, but in reality the landscape shifts and whoever governs needs to weigh whether it's actually a good idea after all.
So again, no, I'm not saying everything should be overruled by the executive, but I am saying they should reserve the right to do so if it makes sense to do it, Pand the consequences of not vetoing it are so severe as to risk serious national harm.