How do you even come to that conclusion? The story criticises both Makoto and Hyumans. How hyumans and their society cannot stand the existence of Makoto who's basically just doing good things for cheap and a bit different looking and constantly pesters him and troubles him that's the entire point of the whole arc. Everyone is after his ass for their own stuck up reason. As for Makoto he's half assed because he's too strong he relies on his strength too much and delegates most of his work to his subordinates. He doesn't think properly about things in long term and is still naive about this world because he's basically been coddled by his subordinates.
(The following is based on the LN. The manga follows that pretty closely, but softens it in many ways... Largely by just not being explicit about it.)
The story doesn't really criticize anything. It takes selfish (even murderously ruthless) behavior as the norm and never questions it.
1) Rembrandt murders his own fiancee in order to steal her business (after he murders her father). Does the story ever criticize him for that? No.
2) Makoto doesn't promote or teach anything different. Rather he's handed an ever-increasing group of completely loyal servants. (And unlike re:Sime where Rimuru's subjects are won over by his personality and very real desire that everyone live a happy life.)
3) Merchants are running trade association which is fundamentally based and "Join us, be subservient to us and play by our rules or we'll wipe you out". The author doesn't criticize that.
4) Team Makoto's pushback against the merchants isn't based on morality but rather on might.
Makoto is stronger than the merchants, so how dare the merchants push Makoto around!
5) Later in the series, Makoto explicitly says that he was a poor merchant, and resolved to do better.
6) Demons are no better. Later in the LN is mentioned in passing that the demons are
genocidal. (With no criticism from the author of course.
Nowhere in this does the author criticize. Basically it's a dog eat dog world with all the major players playing by that rule. The only real weight against that is "Oh, I owe this guy a big debt, so now I'll treat him better."