Harrison Clark already knew that this person might develop an anti-human personality after waking up, even before he took action.
But he still hoped for a miracle to happen.
Unfortunately, no miracle happened.
So in the end, Harrison Clark had to use the forced control of Song of the Wilderness to forcibly take over Franklin Stevens' personality.
This would slightly suppress Franklin's potential.
But it didn't matter, as this person who was supposed to die had survived and become someone who was apparently useful.
This was how Harrison handled Stevens.
Of course, as for others, he would adopt different strategies for each different person, not necessarily using Song of the Wilderness.
Some people might simply lack an opportunity.
Harrison would continue to find one hidden gem after another and set things right from the details.