Same here. I finally brought accidentally deleting stuff down to zero by having them type the number they get to lose:

"You have 55,231 GitHub stars. Please type 55231 if you want to delete them all."

But I guess, if you delete repos often enough, this will also become muscle memory.

Edit: Just saw the other comment here suggesting the same: https://news.ycombinator.com/item?id=31033996