don't act like Oda did something nice....
"I just can't figure him out... Whether he's cruel or kind..." page 21.
And Oda's subordinates think he's kind.
Author isn't trying to make him look kind, just ruthless with enemies, and loyal to his followers if they're of any use to him.
I mean, he can't please everyone if he has such big ambitions, he better only be kind to his family.