man. derek is such an interesting character in season 1, especially when you can look at him through the lens of having seen the whole show, because he's like an unreliable narrator for scott, even though he's not a narrator for the show.

the thing is, derek in season 1 is the primary vehicle for werewolf lore. as new viewers, we're reliant on his character to explain to us the rules and conceits of the genre, but once you've seen the whole show, that role is no longer necessary. but for scott, in season 1, derek is the sole source of werewolf intel. derek is werewolf jesus. which means that everything scott initially learns about being a werewolf is filtered through the Derek Hale Trauma Matrix, and neither of them know it.

for example: in 1x05, derek tells scott that pain is what keeps you human (which is a mantra that gets repeated and referenced a ton over the course of the rest of the show). scott has been a werewolf for all of five seconds, and has no choice but to take the word of this obviously much more knowledgeable werewolf. in that way, derek operates as a kind of narrator for scott, giving him information and context he couldn't really get any other way. but it's unreliable info. don't get me wrong - derek isn't trying to be an unreliable narrator; he's not aware of how much his life experience has colored his understanding of his own species. it's just that...well...derek is a twenty-something with the kind of trauma that eats other trauma for breakfast. of course he would say that pain is what keeps you human. at this point in the show, pain is all he has.

this is the same guy who, in the next episode, says this:

DEREK: You getting angry? That's your first lesson. You want to learn how to control this, how to shift-- you do it through anger, by tapping into a primal animal rage, and you can't do that with her around. SCOTT: [defensively] I can get angry. DEREK: Not angry enough. This is the only way that I can teach you.

except we know, and scott quickly learns (in that very same episode, in fact), that this isn't true. anger doesn't work for everyone, and it doesn't work for scott, who's not an angry person. the things that work for derek won't work for all werewolves - but how would derek know that? he's never had to teach someone to be a werewolf before. he's not actually werewolf jesus.

to scott, derek is the only trustworthy source of information on being a werewolf, because he's the only werewolf scott knows. and from derek's perspective, everything he knows about being a werewolf must be true, because it's true for him. derek is the narrator, and it's only as his backstory unfolds that the viewers, and scott, learn just how much his history and trauma have obscured the reality of things, even for derek himself.

pain is not what makes you human. it's what makes derek human. because the moments in derek's life that stand out to him most are all tinged with tragedy. mercy killing his high school girlfriend. losing his entire family in a house fire. the death of his sister. for derek, to be human is to be in pain, and to be angry about that is the only way to be in control. after all, he doesn't have anyone teaching him otherwise.