Marvel Zombies

I just don't understand how like all the avengers got infected, why is EVERYONE trying to sacrifice themselves?? And like Thor... how? Like HOW? Did Stormbreaker just DISINTERGRATE? Like wtf? AND BRO ROCKET WAS JUST... yep. So much more, so many twists. Was peak just pissed about how the plot just fails at certain points. Got really confusing towards the end, and the last episode just leaves you with so many questions