Not only that, but he has endured a lot of pain himself over the years. Never knew mom, dad suicided, the guy he finally got along with died to save him, his teammate died and he failed to keep his promise, his sensei died, Sandaime died, his student defected from Konoha, his classmate (Asuma) was killed by a group it turns out his best friend was controlling the whole time and then he needed the resolve to try and stop him.
There are very few people who got that true definition of shinobi above Kakashi, but there are some. People like BZ, Itachi, Madara, hashirama, etc. Kakashi is an example of one who endures, the man has seen hell and hasn't strayed from his path. Gotta respect that.