1. The blood dripping scene was set up on purpose to show how silent Arya was. Her stealth is so good that her footsteps make LESS sound than blood dripping on the ground. You completely missed the point of the scene. This is further established in episode 1 when Jon asked how she snuck on him so silently.
2. She didn't appear out of thin air, she was sprinting silently... you know like an assassin would be able to? Did you not see the hair of the white walker get blown by a burst of wind? It was her sprint silently. Maybe pay attention.
3. This show isn't about the White Walkers. It's about the starks and lanister children and the struggle for the Iron Throne, the white walkers are just one obistale they have to overcome. The White walkers were always a threat but the show has alwayd been about what humans do to each other for love, hate etc. The white walkers were barely in the show, and really it only ever involved one main character (jon.) So I have no idea how you can say the show was about the White walkers unless you just didn't fucknig pay attention.
4. It was pretty obvious by context clues that the signs the white walkers use were the same as the Children of the Forest but changed as a fucked you to their creators. It's basically their upside-down cross.
5. The build up isn't for the fight with the white walkers, its for the iron thrones. The Iron Throne is what this show has always been about. How you dont' know that is beyond me.
There's, I justified it pretty well. You can still not like it, but it's easily justified with just a little thought than the surface level circle jerk of hate people like you pour on it.