We are more than five months removed from the debut of Avengers: Infinity War and fans are still reeling from the film's conclusion. After collecting all six Infinity Stones, Thanos erased half of all existence with a mere snap of his fingers.
It sounds harsh, but Thanos thinks it is necessary for the preservation of the Universe. In a conversation with his daughter Gamora, he states it is all a simple calculus: A universe with finite resources can't survive if life continues to expand.
If you want to take an Olympic level leap and believe Thanos' intentions are altruistic and well-meaning, you have to at least point out the flaw with his plan. This isn't the usual, "just create more resources" argument (although it is true). The problem here is his solution is too simple.
Cutting the population of thousands of planets will not create the balance Thanos says he wants. There are too many variables at play here and The Mad Titan's actions will have a devastating impact on just about everything.
It is hard to speculate on the effects of locations like Sakaar and Xandar, given that they're fictional. Luckily, there is a very real place in the center of the MCU in which we can: Earth. After some thought, it becomes clear our planet would not be as grateful as Thanos probably believes.