Arnold had a very clear sense of morality when it came to the Hosts: allowing the Guests of the park(s) to inflict pain, misery, and suffering on the Hosts - which he knew would most likely happen - knowing that they (the Hosts) were Conscious beings was wrong, which is why he tried to convince Ford that they couldn't open the park.
Ford clearly shared Arnold's knowledge of how the Hosts would inevitably be treated, but initially refused to believe in his partner's certainty that the Hosts were in fact Conscious beings. He later came to see that he had been wrong in that regard, but what set him apart from his partner is that, rather than taking a direct moral stance against the brutality of the Guests inflicting pain and suffering on conscious Hosts and trying to prevent it, he instead set about 'guiding ' events and circumstances to a point where the Hosts could achieve consciousness and fight back against that brutality themselves. In effect, he was "teaching a man to fish" whereas Arnold had tried to "give a man a fish" .
Ford clearly shared Arnold's knowledge of how the Hosts would inevitably be treated, but initially refused to believe in his partner's certainty that the Hosts were in fact Conscious beings. He later came to see that he had been wrong in that regard, but what set him apart from his partner is that, rather than taking a direct moral stance against the brutality of the Guests inflicting pain and suffering on conscious Hosts and trying to prevent it, he instead set about 'guiding ' events and circumstances to a point where the Hosts could achieve consciousness and fight back against that brutality themselves. In effect, he was "teaching a man to fish" whereas Arnold had tried to "give a man a fish" .