Strange as it may seem to read, Deathstroke once believed in a cause. A look at his past showed how loyal he was to the US military when he was a career soldier. However, Deathstroke Inc. #10 (by Ed Brisson, Dexter Soy, Veronica Gandini, and Steve Wands) made it clear that his treatment during the experience that made him a super-soldier changed his view of service. a country.
The way the military casually dumped him after the experiment seemed like a failure made him bitter. He felt betrayed by the country to which he had given everything. As a result, he wouldn’t and couldn’t forgive this. This sting of betrayal may explain why Deathstroke took the mercenary job instead of returning to active duty with his newfound powers: it had shattered his belief in fighting for something other than himself.
The issue revealed that the same experiment that made Deathstroke the threat he is in the present also killed several other soldiers. Slade Wilson was an oddity among the test subjects because he survived the ordeal. Despite this, the military still considered him a failure due to his weakened condition. Unbeknownst to them, he could hear all of their assessments. He angrily realized that after more than a decade of service, the very people he had sworn to serve had turned against him through events beyond his control.
What makes the situation even worse is that Slade had volunteered for this experiment. No one had forced him. There was no personal pressure. He chose that. Back then, Slade was a patriot. He believed that this experience was a chance to better serve his country. Instead, all he got out of it were months of suffering and the untimely end of what should have been a distinguished career. It would have upset any man.
However, Slade was no ordinary man, especially after the experience. The doctors treating him had jumped at the gun and mistakenly assumed that their experiment had yielded no results. It allowed Deathstroke to adapt to become a super soldier privately, but he never forgot how easily the people who created him rejected him.
This might explain why, once he adapted to the change and better understood what he was capable of, he didn’t become a soldier again. He could have been an invaluable asset to the military, but in that moment he realized that was all he could be: an asset. A tool they can use and set aside when convenient. The military lifestyle no longer appealed to him as he saw that there was no reward for his loyalty.
If his dedication was not to be appreciated by the best-funded military in the world, whose soldiers are supposed to be appreciated, then he saw no reason to dedicate himself to any cause other than his own. This critical mistake on the part of the military created a monster that would fight for the tiniest of reasons and is not bound by morals but by selfishness.