Lmao, So I guessed right, dude just want a legit fast way to get rich and the old bar owner is easy target + Simon can just swallow the guilt or erase it by giving feel good speech about community and declare bar owner evil hence guilty/death sentence. Megadouche move to fuck over someone's life, power do change people after all, understandable.
Simon could have done that at any point before in his life, he did not need an Incubus King shard to kill an asshole and steal his stuff. It was not so much about the bar owner being an "easy target" as much as being the
only target in Feroholm.
He never did it before because it wouldn't have mattered, even if he could have been personally well-off and done some Robin Hood shit, none of that would have ever been enough to help actually defeat the Incubus King and make sweeping and systemic improvements to the world. He kept working with the Chosen for like 20 years instead of building his own wealth and power because he understood that his best shot at making a difference was helping someone who actually had the potential to grow more powerful than he ever could.
Getting the shard changed all that because it gave him the
potential to actually achieve his big goals himself, so now he needed to build his own power foundation instead of working for other people using means that had failed him for over half his life. Time was ticking and the world was already a powder keg, he didn't have the luxury to work another 20 years to build his own wealth while people are suffering and huge wars are in the horizon, so he took out the worst person that had what he needed to start making a positive change, simple as that.
If you still think Simon was being "just a douche" about killing the bar owner after all the good he managed to do with what he gained from killing him, then you are kind of an intractable moralist or just trolling at this point, specially considering the other half of my post was Simon stating precisely that actually having more power (real power, not the potential for power) actually made him more cautious about how he uses his power rather than more ruthless and reckless.