The TFA Decepticons are fucking vicious, actually.
Megatron only talks about freedom whenever he is manipulating or rallying the Decepticons. (Not to mention: Authorizing the use of chemical warfare, killing anyone who betrays him, etc…I could talk about his evil-doings all day).
Starscream creates sentient clones of himself to kill Megatron, (including hijacking the Lugnut Supremes as an attempt to literally destroy everything and everyone in Detroit, Megatron, most specifically).
Blackarachnia betrays a vulnerable bot (Wasp) into becoming an experiment for her own personal gain.
Shockwave traps and crushes his “fellow agent” (Blurr) into a box, sentencing him to a fate worse than death.
It’s implied that Blitzwing cannibalizes other Cybertronian parts. (Well, Random said it, so who knows with him?)
Lugnut’s P.O.K.E. (Punch of Kill Everything) can literally do exactly that.
And this is excluding their crimes in the AllSpark Almanac.
Yes, the TFA Cybertron Autobots are bad too, but let’s not forget that the Decepticons are Decepticons for a reason.