>>5787963He won by not being the biggest piece of shit.
Megatron tried to burn the entire planet to the ground, restarting the entire war with his cronies and tried to have all of the returning neutrals killed by using Devestator as his mass murder machine.
Prowl and Arcee got caught killing Ratbat for the evilulz and Arcee was openly revealed to be still an irreversibly evil and murderous tranny abomination that should be executed
Finally, Bumblebee (leading the Autobots because Prime ran off crying because he found out that the neutrals think he's a monster/war criminal on par with Megatron) didn't do jack to stop Arcee and Prowl's reign of terror (granted, Prowl was being controlled by Bombshell, though that was more of a bullshit asspull after the writer panicked over the backlash against asshole Prowl) and wanting to kill the neutrals out of jealousy because they got away from the war. Worse, Bumblebee had to be FORCED to hold an election: he wanted to establish a new Autobot Reich specifically with the goal of making the Decepticons suffer, since he felt that the Decepticons (by rebelling against the state, which had most of the high ranking Autobots like Bee outright working as Cybertron's Gestapo/SS before the war broke out) deserved to live in squalor and not be allowed to peacefully integrate back into society.
Starscream was the only one who realized the war was over and that it was bullshit to hang onto the past and after Megatron's rebellion was squashed and Prowl/Arcee/Bumblebee exposed as frauds, he won by flat out BANNING all Autobots and Decepticons from the last remaining city state on Cybertron that everyone was living in and demanding everyone go badgeless (something a lot of Autobots, like Blurr and Jazz went along with, along with Ironhide and Wheeljack later on)