See, one of the reasons I like Megatron (and certain other Decepticon characters--*coughcough*Soundwave) is because they are perfect examples of the slippery slope of villainy, at least in their more modern incarnations. They rebel against an unjust system, tear down the oppressors, and then, as they start embracing their whole 'the ends justify the means' philosophy more, they gradually became as bad or worse than the oppressors the had originally rebelled against, in effect just perpetuating the cycle. Or sending it into an ever-worsening spiral, I'm not sure which ...

But I'm sure Megatron and co. don't think of themselves as villains. No dictator/warlord/gangster/king ever does ....