tbh yeah I think that’s basically his driving philosophy when it comes to his dream. A lot of people get weird about it and think that means he was born as like a cutthroat ruthless evil kid who’d do anything to get what he wants lmao, but yeah I mean his motivations are complex and interesting but you can boil his attitude down to the end justifies the means.
He does commit acts he believes are wrong in the course of achieving his dream, because he considers the goal to be worth it.
There’s also a side of his belief in fate at play, where he thinks if he achieves his dream then that’s a sign from a higher power/arbiter of these things that he was meant to do all the wrong things he does along the way to achieve it.
But it does all come back to guilt. If he achieves his dream then the deaths of all the people who died for it will be meaningful and justified. They died for his dream, therefore he must achieve it.
Also it’s worth noting that the things Griffith considers to be wrong, that make him feel guilty, are mostly things Guts brushes off and doesn’t even give a second thought to. Kill hired goons and keep the money we were supposed to pay them? Yeah that sounds fine. Fight a war, leading many people to their deaths and killing many enemy soldiers? Duh that’s just life. Assassinate people? Yeah why not they’re dicks and I like killing people. Griffith’s mountain of guilt corpses include enemy soldiers, people his Hawks killed, etc. It all fucks him up.
So yk in that sense “the end justifies the means” comes down to what the person in question considers wrong. And Guts also shares this philosophy when his ends (eg become Griffith’s equal, kill monsters) justify his means (abandoning all his friends, torturing apostles for information or fun, using kids as bait/hostages, etc). Guts just has a different standard of immoral, and he crosses it a lot too.
And I tend to think that a major aspect of Berserk is showing how this philosophy can corrupt you, until your means get worse and worse (eg Griffith making the sacrifice) because committing a constant stream of acts you yourself find morally reprehensible kind of numbs you to it and makes it easier to do worse.
Guts leading his Raiders and killing thousands of people in his life would never lead to Guts making a sacrifice, because Guts doesn’t care about the faceless soldiers he kills, he doesn’t feel guilty about being a mercenary, and he differentiates between his friends and everyone else. His friends are important, everyone else isn’t.
Griffith doesn’t differentiate. All those deaths hit him, he deliberately refuses to see the Hawks as his friends because he’s well aware that they can and probably will die for his dream, what with being soldiers, and so eventually sacrificing the Hawks starts looking like adding one more generic scoop of bodies to a mountain.
Sooo idk basically I think you’re v right, his guilt plays a major part and most people would say “Griffith thinks the end justifies the means” and use that as a reason he’s an evil conniving sociopath, but yeah imo while it’s true that Griffith thinks that way, it’s a lot more complicated than “and that proves he’s evil” lol.