Confused over 9k

I don't understand why he can't be safe by giving him the information that he'll die. I mean, why isn't this enough? Can't he be careful and watch out? Why does she have to travel again and again and find out who killed him? I mean, sure, it's interesting, but.. bro, be careful when you know you're gonna die, lol. This point doesn't really make sense to me and I apologize if I am just too stupid to get it. ? like the last 2 pics (?) there weren't major changes. It would've be enough, if this dude wouldn't let them kill him and everything would've been fine. ??