Come to think of it, the whole show could've been named that lol
Anyways, to the point.
Throughout the show (or books) we see many characters doing evil deeds, and for the most part we're provided the motivations a huge ass deal of time after that. Like Jaime's reasoning to kill Aerys, Tywin's reasons for all the masterful politics he was doing, Jorah's reasons behind his letters to varys etc etc
Now the topic I wanted to discuss in detail here, are the differences between motivations of certain people that justified their actions in their eyes. Jaime I'm not going to touch, as breaking your vows and losing your honor to prevent mass destruction of a city and hundreds of thousands of people is straight out heroism, no matter what side you're aiding.
Regarding Tywin, I find his reasoning to be as good as the one any Lord could have. He did undeniably evil things, but there is one particular thing Tywin does not do, like most of the villains in history. He does not intend to destroy the kingdom, or even his enemies really! He wants to control it, and see it thrive as his legacy. Same thing was the reason why the Westeros was a thriving economical hub during Aerys II reign, when Tywin was hand of the king. Overall, I find his way justifiable, but we all know I'm not a moral one. I do think he had no less right to do what he did than Targaryens through the two centuries of reign.
Speaking of Targaryens. Dany. Hooooolyyyy shiiit. That's ought to be the most hypocritical character in the entire show. Saying "I will never do that". Moments later, she does. Jeebus. A madwoman, entitled brat, fucking her way into the power in the most literal way...
Wait motives, motives. I'm getting astray, damn you my brain. So she's motivated byyyy... Her "right" to the throne! How... Honorable! Jesus, even I can't stand the sarcasm in the last sentence, beg your pardon *vomits*.
Aight, where was I... Ah, motives. So she goes on and on about bEiNg a RiGhTfuL kWeN. Jesus fuck. I'm blaming Jorah for the entire bullshit that went down in Westeros. But I get him tho... Cus had it not been for Jorah making sure she gets through, and Viserys for making her literally CRAVE FOR THE THRONE. (I'm pretty sure she was turned on by the sole thought of it, but hey, that's just me being a cunt) she could actually turn out to be a pretty good ruler! She had the potential. It just got utterly wasted by the messiah complex and her obsession of the Iron Throne. And GOD HER ENTITLEMENT IS WORSE THAN JOFFREY'S. But I'm getting distracted again, back to motives. So yeah, Iron Throne obsession, plus wanting to help people in the beginning. Okay, good so far. Until Westeros. She want batshit crazy there. "BOW TO ME YA SHITS, I'M YER QUEEN" was pretty much what she did. "Yo, I'm from a mad incest dynasty, i got a fucking dragonx3, plot armour and I'm a fucking Dothraki more or less. Wanna join? If not, then you're dead". That's like... The worst first impression you can get ever. So the people disliked her. And she did not like that they don't like her for being an entitled brat. God, that's ironic. So she actually grew to hate people. Aaaaaand, we know how that ended. So I'm saying, that Dany did have good intentions and... Okay, more or less good motives before Westeros. Then I'm never calling it a good motive. She was straightforward "GIB STEEL CHAIR" and there was nothing else there. So unlike, per se Tywin, her actions did not have motives that had a potential aim of stabilising anyone's but her future. (and yes Tywin's did, since LEGACY is for the ones AFTER you, not for yourself. Even if it's just a side effect, it's still good)
Now you may say "But Dom, she would leave a legacy too!" yeah sure. Like anyone would even want to be under her rule since she burned KL. That'd be worse than pure fear rule. Wait, that actually was a pure fear rule for the Westeros part. That's actually hilarious.
Now if you actually beared to read through this (and God help me if I think it's easy to bear with what I write and how I write), I'd like to hear your opinion on the matter (not speaking to you Godzilla, but you still can voice your opinion nonetheless), so we can discuss it furthermore. Who knows, maybe even someone will convince me I'm wrong in some way? (don't worry Godzilla, you don't have a slightest chance to do that)