Originally Posted by
Vic Vega
That was explained, up to a point.
It's been awhile since I read the original series, but the way I remember it Icon was a one man underground railroad freeing himself his adoptive parents and others. He became a Lawyer during Reconstruction. His parents pass away. Once he realized how long his lifespan was compared to humans he started trying to keep a lower profile. But he did meet and marry a woman during the 20's. I think years later she ended up dying of a disease that Icon's alien science couldn't cure.
After that he kinda of stops giving a damn about everything and lives as a Highlander like near recluse until he meets Rocket.
Icon being an Super Powered Alien, took W.E.B. Du Boise Talented Tenth idea to extremes. He thought just by existing as a good example he didn't have to do more. That and the whole alien keeping a low profile deal.
If Rocket didn't remind him of his late wife and more specifically the kid he always thought he was going to have with her, he'd still be doing nothing (his interest in her is strictly paternal).