I think the whole point is that these parents are still extremely traumatised over the death of their first Adam. There grief was so intense and they loved their son so much that they were willing to try this extreme scientific experiment to have him back.
They have been through so much and even though it's obvious that their kid is dangerous they can't bear the thought of losing him all over again. They still love their son so much (although I think its still the memory of the first Adam that they are clinging to) Also, there is still a part of their sweet, happy, normal boy in there somewhere and it's not his fault that he was killed by the car or that he was reborn with mixed DNA, it's the parents fault and the Doctors fault so I think they feel too guilty to end it. I actually felt sorry for what was left of the first Adam that you saw glimpses of. He was obviously the same happy normal kid he had always been and was obviously terrified and confused by what was happening when Zachary began to take over.
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