Look, I know Texas liked rebelling over concerns that the parent country didn't look kindly on chattel slavery, but combatants getting killed, either in combat or when executed as traitors, after starting those wars isn't being “murdered".

> Should the Mexican flag get banned because I'm offended by it?

The Mexican flag of that war is no longer used; the current Mexican flag was adopted in 1968 (or 1995, depending on which side of the flag you are talking about, though the latter was clarifying an ambiguity in the spec more than a new design.) So, even if your concern was agreed to be otherwise valid, it's kind of like asking about banning the modern German flag because of the Nazis.