I would concede that it is debatable whether a no deal Brexit is putting the country in peril. I could point out how it would be if you like, but I will mention the break up of the Union for now and leave it at that. Remember that in many ways our public services are already teetering on the edge and the large number of people who are a couple of wage checks away from repossession, or homelessness.
I agree with your assessment of the Brexiter credo, however I would put that down to the editors of the Sun and the Daily Mail. Along with a rump of toffs in the Tory party. So it is not really a valid credo, rather the result of scaremongering and an outdated bulldog spirit sentiment. As for the motivation of the toffs, I think sir Bill Cash illustrates the problem. As far as he is concerned the German government has a stranglehold over any decision made in the EU parliament and it is only allowed through once hard nosed, hardline German power brokers give it the nod and that our sovereignty is at peril if we remain in the EU.
I would suggest that the numbers of Brexiters who still hold to this credo has eroded over the summer and it does not need to erode much to have lost its mandate.
In addition I just wanted to mention the democratic principle you mention. I agree with your point, but in my opinion there is a mis understanding of democracy in the minds of the people you refer to. I think I have already pointed this out a few posts back, but I will repeat it, as it is an important issue in the division which has developed in the country.
There is a sacred principle in the minds of the people in our country, the principle of democracy. Which they are taught about in school and that the UK is the last bastion, the defender of democracy due to our history etc. But many of the people who hold this view, as I have done myself, don't realise the inadequacies of democracy and that in this country it is exercised, fundamentally, as a system of representative parliament with an executive which is accountable to that parliament, which is regularly changed by a democratic process.
The way in which the democratic principle is exercised in this system is the way in which the executive is changed, or endorsed at regular intervals by a public vote.
At no point is the public asked for their view on any particular issue and carrying out a referendum is a different exercise to our decomcracy, it is legally, only an advisory exercise and a difficult way in which to conduct constitutional change. I lay the blame and cause of all this turmoil over the last few years at the door of David Cameron's government and the folly they entered into in this exercise.