My own preferred method – assuming they resume nuclear testing – is to strap them to the device out in the desert or Pyongyang or wherever they’re setting it off.
The social contract is enforced through the voluntary consent of the bulk of the citizenry, not by draconian punishments.
And several orders of magnitude more energy-intensive and expensive that just shooing them in the head.
We aren’t. The world was a cruel place from the time life began, and it will be a cruel place long after you’re dead. Survival of the fittest.
Nasty, brutish, and short.
Those are my attorneys.
Why can’t I have my sharks with friggin’ lasers on their heads?
That’d be cool if the lasers were targeting lasers.
Uhhh…it would encourage scientists to develop faster, more powerful, and more efficient rockets?
Because that’s about the only upside to this plan I can think of.
Who would be in charge of loading these people into their death rocket? What kind of person will it turn them into, being an executioner like that?
I have to feel that if your plan to making the world a better place involves genocide that maybe it needs rethinking.
What if these acts of inhumanity (according to the OP) were justified? For instance, you speak of harming/abusing animals. Does that mean you don’t eat meat? You don’t use products tested on animals? What about human torture - does that include torture in the course of war? It’s commonly used, so should all of those people be shot in to the sun as well?
Your idea is very flawed, in multiple way. Good try though.
But it’s really good filth! Fertilizer! Line 'em up out in the broccoli fields and shoot 'em.*
All while singing “The Circle of Life.”
*non-lead bullets, of course.
Again, what part of “we as humans” gets to do the deciding? We’re not all going to agree. If no one else, the guy strapped to the rocket is going to object.
How about the other objections I raised? No ideas there?
We as humans know that capital punishment is wrong. Always and everywhere (even on the sun).
So NOW you got a damn PARADOX on yer hands. Nice goin’…NOT!
I think we’re supposed to be rationing our answers. How many does that allow us?
I would just like scientific answers. I figured this little randomized proposition would have multiple flaws. I’m glad that you all are helping me discover these.
Be aware that I would not actually shoot people at the sun… 
it’s common sense that doing such a thing would create chaos everywhere… I merely wanted clear and justified conclusions. Good thinking, people!
Work with me here…What if, instead of rocketing them into the sun, we built specialized facilities where such people might be confined, under guard, until such time as our legal system determines they may be released? Think of it as a form of penitance.
Nitpick: mass execution, probably not genocide, but your point still stands.
Seems like the death sentence for anything the OP considers an “inhuman” act is a bit severe for my sense of justice. I’ll pass on electing the OP as supreme leader. Next.
To what question?
Yeah, you’d think a degrading orbit would be easy to set up. Am I wrong?