[cesarb]

> When the user profile folder is unusable for some reason you either have to do this or just refuse login. Neither are good answers, but this one is better as long as you understand what the system's doing.

As this whole discussion shows, no, this one is worse since it can easily lead to data loss. A third option, however, would be to do this but not erase the profile on logout.

[bscphil]

Or an even better fourth option: the warning message literally says "you cannot access your files". https://i.imgur.com/6jk6imp.png

That is apparently false because the user did access their files and dragged them into the temp profile.

Either that should be literally true (a completely broken profile is a bad problem that needs help from a competent tech support person) or the profile should at least be made read-only until the entire profile is deleted. That way they could copy the files into the temp folder, but not lose anything (other than changes) after logging out.

Also, the warning should be more obviously "fatal", not something to be clicked through. E.g. replace the desktop background with a black screen and put the warning text in red on it.