depends on how they are advocating it. If they arent directly saying "go commit genocide" and are only saying "hey genocide would be cool" they arent inciting anything. thats an expression of an opinion not actively inciting anything, just like saying "man wouldnt it be cool if someone robbed jimmy joe bobs house" isnt illegal but saying "yo billy bo bob go rob jimmy joe bobs house" is illegal.
an example closer to the one given in the post would be that its not illegal to say "hey jimmy joe bob doesnt deserve to live anymore and is an inferior human" but it is illegal to say "hey go kill jimmy joe bob because he doesnt deserve to live anymore and is an inferior human"
It's illegal to hire a hitman as it's illegal to hire any individual to perform any illegal crime. To advocate for a crime to take place is neither performing nor directly enabling a crime.
neither of those are applicable in either example. For anyone charged in either situation itll always be first degree murder as any death committed in the process of or as the result of a felony (in this case conspiracy to commit murder) is first degree murder for all member of the felony.
depends on what you mean by aftermath. In the case of someone not actively inciting genocide but declaring a preference for it the worst aftermath they could legally have is being barred from privately owned locations and verbally ridiculed as long as the ridicule doesn't cross into harassment. Anything else would be unlawful and no government in the US be it federal or all the way down to a town counsel can do anything to them for declaring their preference on something. If a private citizen tries to do anything to them it will very likely be a crime they can be arrested for.
an example closer to the one given in the post would be that its not illegal to say "hey jimmy joe bob doesnt deserve to live anymore and is an inferior human" but it is illegal to say "hey go kill jimmy joe bob because he doesnt deserve to live anymore and is an inferior human"