I used to love Bumblebee as a kid. Back then I would usually buy only one toy of a character (I had very few Optimus Primes), but I bought tons of Bumblebees. There are a lot of people who hate him, but the character wouldn't have lasted 34 years if he was hated by everyone. Bumblebee is one the the few Transformers that is a household name. So by your logic, is it wrong when soldiers kill enemies in battle? Is it wrong when police officers shoot dangerous criminals? I'm not necessarily trying to criticize pacifism, but I'm not sure why you'd be a fan of an action franchise if you're totally against violence. I'll say it again, Autobots are not superheroes, their soldiers. They're not concerned with saving every life as much as they're concerned with the greater good. In G1 Optimus refuses to help his friends for fear of endangering humans. There are plenty of times he and the other Autobots attempt to kill the Decepticons. I doubt Bumblebee has a "Decepticon jail" on Earth in the 1980s, so he can't just imprison them. And we don't even know the context of the movie. We don't even know why Bumblebee kills the Decepticons (if he even kills them at all...it could be humans, or maybe they survive). If he kills them, it could be a perfectly good reason. I'd at least see the movie before criticizing the character's decisions.