One of the most relevant episodes of DS9 to today is "Business as Usual" from season five.
In it, Quark gets into selling weapons, but is overcome by guilt when one of the clients wants to use them to commit a genocide of over 20 million people.
Quark comes to the realization that if he sells weapons to someone planning to commit genocide, with the full knowledge that they're going to use those weapons to commit genocide, then he too is complicit in said genocide.
It's crazy how the greedy profiteer on a Sci fi show from 27 years ago was able to understand this concept but the US government can't after 11 months of Isntreal destroying Gaza