Billy the Fish
Technocrat
No-one is claiming that 'no deal' is a good thing. It would be bad for both sides and that's the point. The 'no deal' option is a deterrent to ensure we achieve a mutually beneficial deal with the EU. If we were to have a negotiating position of 'a deal at all costs' then the EU would have no incentive to compromise. This is just basic negotiating strategy and is used for example (and taught) in conflict resolution.
This is a point that remain voters are happy to ignore over and over and over again. She has to set her stall out for a hard Brexit in order to to leave room for compromise, Corbyn has already given his hand away .There will no doubt be many compromises once the posturing and politics is put to one side and business takes over.