@Kryptomightguy His beliefs, of which Megatron vehemently detest yet inspires his Autobots to be compassionate, to care for those smaller and more fragile than them
It led to Shredhead, to Cliff sending them to Earth so they can save Carly, to them arriving in the nick of time to save Optimus
@Kryptomightguy Optimus' optimism, his ability to inspire others to be better, his fatherly bond with his Autobots, his children
That's what ultimately caused Megatron's downfall