At least for me, over 90% of unintentional file deletions (not counting ill-considered deletions) are due to mv and cp rather than rm. Being careless with them can easily end up overwriting a file's contents with another. For instance, once I was typing out a few commands of form "cp foo.txt bar.txt baz/", but I inadvertently hit Enter before writing "baz/", causing bar.txt to get overwritten with foo.txt. I don't know of any good solution for this issue, apart from my current rule of thumb never to use more than two arguments at a time.