These are all nothing but hyperbolic presumptions and scaremongering.
No, they're realistic projections based on common sense.
Mind control and/or elimination of few top people in charge doesn't necessarily need to be messy.
Doesn't
need to, but would be.
There's no way in hell he could take over without having to eliminate a great many people, both super and normal humans.
He'd have to get enough evolutions under his belt in the hopes that it would push his mind control abilities to the point that he'd be incapable of repeating past mistakes... Which H.E.R.O. would not allow without the means to counter or terminate him with automated failsafes before he'd even get to that point, assuming he even manages to get more evolutions either naturally or H.E.R.O. injecting him. That's something they'd be incredibly reticent to do without already having safeguards in place, including a killswitch.
At that point, his only resort is to have been doing it for a long time and without advancing enough for H.E.R.O. to consider him a threat, with each and every single instance of mind control increasing the risk of discovery, and only at the lowest possible ranks of H.E.R.O. and aligned groups.
That makes it a numbers game on his part, which itself cannot work against any of the Captains, let alone most of their lieutenants, because they'd straight-up annihilate those under Jake's control before doing the same to him.
Remember, he'd be going up against powerful people who have vastly more experience in that kind of arena than him, knowing how to work the system far better than they'd ever let him get to.
Additionally, this is something people in charge have been doing already and for years if not decades, so what's exactly different about Jake doing it, that'd makes him doing the same thing so pearl-clutching worse?
"People in charge" have been using mind control to usurp positions of power for years, if not decades... Wtf???
Also "pearl clutching"... There's no shock or exaggerated display of shock from my end at the idea of Jake taking over. The "shock" is in anyone thinking he could or should, because it's moronic.
You'll also need to elaborate on that last point. Why exactly do you think world with Jake in charge would be worse off than when controlled by people who run population-wide eugenics and consider you nothing but inferior cattle and tools, killed by thousands in their child games for supremacy? What do you think he'd even do that'd warrant this sort of statement?
Realistic projection.
Getting to that point, assuming he somehow circumvents/avoids inevitable failsafes and killswitches, would have taken so long and he'd have had to do many things just as cruel, ruthless and underhanded as those he replaces. Not even the best intentioned person would be same at that point. Everything he'd done, he'd have to keep doing those things, and on a scale that would either have to be absolute control, or control of the ones left and giving orders, and all by some miracle never being exposed during his reign, for fear of being overthrown himself.
Speaking of fear of being overthrown, that's a realistic fear that he'd have to live with, be vigilant for, and actively ensure it can't happen by whatever means necessary. That just leads again to absolute control, which isn't doing better than the ones already in power, because it just leads to suffering, death, revolutions and more death.
