Cyberman, evil emotionless killing machine two blokes in Varos? Two blokes doing their jobs!
I don't know, that cyberman in Earthshock seemed pretty emotional to me.
Besides, the Doctor did actually kill either of those workers. One tripped and fell in and then proceeded to pull in the other. Then again it does beg the question, if the Doctor values life so much in other incarnations, how does the Sixth shrug it off so easily?