Infinity War, Not Really Spoilers
I am so far out of touch with the Disnarvel movies
Also they really gutted Thanos' backstory & motives, huh
And why for a super-smart villain with power over primal elements of the fabric of the universe itself.. ..does he just use them to shoot beams of CGI at people
"Aha, mastery over reality itself! With this, I can shoot Purple at my enemies!"
TLDR: It is all very nonsensical, read the Jim Starling comics