>>527895106
I wouldn't call that a "punishment" for doing the genocide route. It is a punishment for continuing to play the game after doing it. No matter what the game frames a true reset/erase as a bad decision. In the true pacifist ending Flowey calls you out, says you are the last threat left and that you should quit and let Frisk live their life.
Chara basically wonders why you're still playing the game, and I'd say that the "tainting" is the way of the game telling you you accomplished everything, this is the mark of completionism, now go do something else.
>>527895276
In universe, yeah, characters think we are evil because, y'know, in universe we are killing them. While Genocide is the evil route, the game doesn't condemn you as the player for it, it recognizes that you as a player are curious, you are willing to taint the game to find more, but that doesn't make you evil, because they're just code, it is all just a game.
Sans:
>not out of any desire for good or evil...
>but just because you think you can.
Flowey:
> I'm just doing this because I HAVE to know what happens.
>Ha ha ha... What an excuse!
>You of all people must know how liberating it is to act this way.
Chara:
>Now, we have reached the absolute.
>There is nothing left for us here.
>Let us erase this pointless world, and move on to the next.
I agree, Genocide is the bad route and the worse of the two endings, but you as the player aren't truly punished for it or judged besides being told "Yeah, you think you can so you must." The game only punishes you (Chara's 'when were you the one in control') when you choose to then reject what you did by refusing to "complete" (erase) the game.