Don't expect every item should be yours through entitlement. There are more hate filled posts about Animus than any other subject on these forums. Rage quitting a fun, content filled game because of 1 hard to attain item is ridiculous. You don't expect SE to nerf something that affects everyone in the game just so your epeen can be as shiny as the next guy's. The game shouldn't work that way. The more rare a weapon is, the more difficult it should be attaining it. If someone received their ATMA in 6 hours, it doesn't mean they didn't earn it, the rules of RNG was the same as yours. If you bought a lottery ticket in front of another guy, and he won a million dollars and you lost, would you write to the lottery and say it wasn't fair, you've been buying tickets longer than him, or you were there first? You are crazy.

TL;DR Life isn't fair.