I agree with CharlieO. I am not aware of any thin-set that would adhere to the ceramic tile surface. It might be possible if the tile surface was prepped properly, but this is a lot of work, like scarifying concrete before painting.
If you crack tiles while prepping the floor, then they have to be removed. Again more work. Plus, you don't know the condition of the subfloor. Yes, it is a lot of work to remove the ceramic tiles, but you will be much happier with the end result in the long run.
IMHO ... It's much easier, and removing tiles can damage your floor and walls, creating even MORE work than a simple installation.