Why do people think a hard-Brexit will work?

I think whatever the arrangement it probably could work with time, and short to medium term hardship. My biggest opposition to Brexit is the apparrent reasons a lot of people want to leave, which strike me as basically xenophobia, and backward looking. The UK has a lot of problems, but I'm not convinced they are caused by EU membership. I also don't have any faith in the politicians who are keenest on a hard Brexit. These are the people who have been advocates of the trickle down economy for at least 4 decades. The net result is more like a trickle up economy, where the gap between rich and poor is increasing. The recent UN report on the levels of poverty in the UK, and the refusal to acknowledge this from politicians, highlight this. I should disclose that a good proportion of my work is involved with EU directives, so maybe I am biased. My company has already planned for a hard Brexit and set up office in another EU country. Their profits will no longer go into UK revenue after Brexit. I'm sure this will be repeated in lots of companies and industries. My final thought on the EU is that there has always been this attitude that they are telling us what to do. The UK is part of this, so EU regulations and directives have a high level input and scrutiny by UK citizens and elected politicians. I am pretty sure that if we introduced our own regulations in my field to replace EU regulations, they would be virtually the same.

Anyway, I don't normally write this much so I'm going back to pointless surreal chit chat now 😁

This morning, I watched as May said that deal or no deal, it would still be better than a Corbyn government.

She’s not appealing to people’s sense of logic, or duty to country. She’s using a Trump dog whistle.

If I was British, I would have the same worries as you.

Hard Brexit, Soft Brexit, No Brexit. All of them will work. They just have consequences. The variable here is the future direction of Europe itself. This is not just a racial/migrant thing. Its about the economy of each member. And in the long term I believe the EU will become a Moby Dick that Britain will be better off NOT strapped to as it goes under.
Yes. There will be profiteering and economic hardship ahead. But that is true for all of the options. I believe that a trip to the dentist now and a painful extraction will be the best long term course.

When ever the EU is mentioned always Germany and France, there 25 other countries in it as well , the EU will be finished due to the arrogance of the peoy running it, and Merkel will be out soon, and macron that arrogant prat is not lasting long

It's just a mess 😟 im worried

My guess is it comes down to the old problem of defining " working". You and the experts who say it wont work most likely have a different set of goals and idea of 'working". The priorities are likely different. This is a key problem with political exchange. Each side says the other's idea's won't work but they ignore that they each define the goals and priorities of the system differently.