Of course they're assumptions. They're assuming that the person doing Y did so in best faith and full knowledge. As opposed to assuming they're cousin loving

Of course they're assumptions. They're assuming that the person doing Y did so in best faith and full knowledge. As opposed to assuming they're cousin loving inbreds who did Y because they hate every computer scientist ever. Assuming that doing Y was indeed wrong, and you want to correct that... do you think approaching it with the mindset of "you're a competent person who made the best choice you could see" is going to work better or worse than approaching out as "you're so incompetent, I've met more capable toasters, and you obviously did this because you hate America"? It's just people skills, my friend. Start your disagreements by assuming the best of your opponent.