@Gen Lee, welcome to the real world. The notion that the good guys follow the rules and win is a hollywood fantasy.
In the real world there are no rules, and people, good or bad, can only become great by doing whatever it takes to win. That is life. You seem to be upset that Lincoln 'broke the rules', thats politics, thats life. You can't get anyway by following every rule 24/7.
That is actually one of the reasons I liked lincoln, unlike most movie protagonists he wasn't perfect, he broke a lot of rules, but that is life and if he didn't break those rules, slavery would have existed in America for probably another 50 years.
I'm sorry that real life isn't like the movies, but I'm surprised your first experience with this is this late in life (I assume you're at least 15 years old, as I don't think a diplomat of your caliber could be any younger)