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Iran...I Walked...I Jihad
Thanos destroyed 1/2 of the Universe in order to appease Death. He is love with her and in order to obtain her love in return...he decided to present her with a bountiful supply of "fresh souls"
LOTS of people in the Marvel Universe were affected. Thanos' own father was taken by this desire to destroy 1/2 the life in the universe. A lot of the Avengers, and other known teams lost important members. Throughout the entire universe (skrull, kree, earthlings, Asgaurd, Olympians...etc) everyone was missing 1/2 of their world's population. Lots of heroes were lost, but without the comics, it's difficult to tell you which ones.
The Living Tribunal, much like the Watchers, did not intercede because it was not Thanos' desire to destroy the universe, it was merely his desire to end 1/2 the life in the universe. Why doesn't LT stop Galactcus from devouring worlds? For the same reason he didn't stop Thanos with the Gauntlet. Because change is inevitable, as long as he doesn't destroy all exsistence....then who is to say that this change isn't for the better? or for the worst?
In theory, if you killed off 1/2 of the worlds population, you would also be killing 1/2 of the worlds terrorists. Though the bad outweighs the good, there is still good that gets done.
It's not Thanos' "fault" that he became the most power being in the universe. He "earned" that power through intelligence and careful planning. If you are a strong enough being to destroy Eternity and take the mantle of Eternity....then you for the most part...deserve to be the next Eternity.