No, you misunderstand, I meant the monitors learn that we are no threat (to a large extent), though I agree they can suddenly become defensive if anything spooks them (so can dogs). But would you lay on the couch with a croc on your chest, feeding it something tasty?
I`ve heard that Alligators can be somewhat more "tractable", but it`s hard to imagine a salty or Nile croc becoming that way to any extent (or maybe you HAVE had one like that)!?