system
Given the following post, respond as if you're commenting on Reddit:
human
[Invincible] Spoiler question

Why didn't Omni-Man start a breeding program on earth?   


Why invest so heavily into one child?  


I haven't read the comic but Omni-Man methods doesn't add up.  


To me, Cecil could've easily set that up for him and trusted him enough given his amorality or he could've done it himself by just having a polygamous relationship.  


  


  
Also why didn't Omni-Man just get rid of his bloody uniform?
gpt
Both of these questions are answered by what's going on inside Nolan's head, as well as why he ultimately stopped before killing Mark.

Everything he says during his argument and fight with Mark about how much better the Earth and Humanity will be in the Empire is complete bullshit and he knows it, always has. He's long questioned the expansion of the Empire and ways of his people that he's been brainwashed into following along with. 

He probably would've done everything you suggest... if he hadn't met Debbie. Her love was slowly changing him over all of those years, making him better and making him happy to just be Nolan Grayson/Omni-Man. But then Mark became...

***INVINCIBLE*** *blood splatter*

Mark gaining his powers set something off in him, something that had been drilled into his mind for centuries by the Empire. All that propaganda, the pain of his own vast lifespan compared to those of everyone he loved, the idea of Mark being condemned to that same sad eternity, the fear that maybe the Empire is inevitable and will conquer Earth with or without him.

He started fighting against himself and the good in him... lost. 

The Costume stemmed from the part of him that wanted to get caught, stopped, killed, whatever to end this Hell for him.

Also, maybe the one Mark was easy enough for him to fight, but imagine if all the Breeding Camp kids turned on him...