Moron's are the ones that don't bother with the facts
Only a moron would make a comment without checking the facts. The guy in question has local backups. I know of no serious photographer who only keeps photos online. Also, if you've ever tried uploading thousands of photos, organising them into sets and collections and the like, then you also wouldn't make moronic comments like it would take a couple of days. Quite apart from uploading of the order of 1GB of data, the online work involved is enormous.
Then there are all the comments which will have been lost, the links that will fail from other sites/ In all, it's weeks of work to sort this out, not a couple of days. I've got about 8,000 photos on Flickr, all carefully organised, and I'd be somewhat annoyed to have to reinvest all the time required to reorganise them.
However, the one thing I can see is that Flickr is a cheap service, and there's a limit to what you can expect at the price, but it's not rocket science to have a "soft" delete service that leaves files where they are for several months after an account is removed so it can be rapidly reinstated.