If the idea is to be rid of the person completely, we don't need to fire them into the sun. Or launch them out of the solar system. They don't even need to reach earth escape velocity.

Just launch them at the sun. Use whatever method you like. Just get them high enough that after gravity starts to overpower acceleration, there is no chance for survival. Boom! No more person. For the most part.

how much to put them into a space suit and a car, strap them to a rocket and then fire them into orbit around Mars ?

Launch them into Betelgeuse instead. It's a bigger target anyway.

Exceptions do apply, things like near-immortal beings or cursed objects may require the destructive power of a Sun and no less

Can a solar sail be used to put a craft into the sun?

So you're telling me shooting a space gun at the sun will miss?

Ummm… quick question: Isn’t that all just a matter of timing?

Wouldn't shooting them into Jupiter be the easiest?

I'm sure I've read a few things about what an impact that big bugger has on trajectories in our solar system.

Intuitively I feel like a push towards Jupiter would be easier than a push to get all the way out of the solar system avoiding Jupiter.

You could always put them in a co-orbit with earth or something and then just use solar sails to provide the delta-v

But I also like the idea of certain peeps having time to understand the error of their ways before slowly falling into the sun faster and faster.

And before some one says “well, there’s still plenty of time for that with a rocket…”

Naw. We’re talking about a truly idiotic person. It’s gonna take them a while,