At around chapter 200 it's revealed that our god is playing this world like a psychotic monster. Ryoma (and many, many others) had criminal and evil traits absolutely packed into his soul. He was placed in an abusive home that also strenuously trained him in how to fight. He's crazy muscular without working out for decades. Several stressors and triggers god put in front of him:

• Dad dying in debt
• He's so scary looking no one wants to even interact with him
• Fired from the one good job after disarming a robber and getting arrested
• Working at a black black company, like physically and emotionally abusive
• Mom dying while he's working 20 hrs a day and he's so burnt out he can't even cry

And god's waiting for him to crack and let loose those urges and go on a rampage. Then Ryoma dies and this psycho god puts him on the shortlist to another world. A world where the gods will bestow upon him whatever power he chooses.

And little comes of it. He loses his temper a bit at the beginning (blamed on age regression) and killed some assassins. Maybe if you squint your eyes, he deeply understands criminals and can think ahead of them. Could be he built up his willpower back on earth and can control himself well now.

The biggest thing is after 100 chapters, it doesn't seem like the gods of the new world are even upset. Earth god handed them a grenade, knowing they would make it into a nuke.

Ryoma struggling against overwhelming power and soul-deep criminal urges is so compelling to me!

Sigh