Data is stored on a hard drive magnetically without any of the moving parts touching each other. The only 'wear and tear' is the spinning of the platters and the moving of the read/write heads - a bit like an old vinyl record player. Deleting is no different to writing as far as mechanics is concerned. Drives are designed to last for hundreds of thousands of hours of use - even if you don't make any reads or writes, the platters are still spinning so 'user action', i.e. writing and deleting files, makes no difference to drive lifetime in the grand scheme of things.
Nelviticus