Wow, you're acting like the Pleroma are bad guys Amos :'(. I think the fact Amos was willing to let it be/give him a choice earns points in Hiccup's books. Since he really just was steadfast in this is Wrong. He's more iffy on if anyone's really given a choice if being Kenoma means being fed what he's assuming is mindcontrol sludge of some variety. But that just means! He's more curious about talking to them and seeing how much of that is true himself.

( Since he'd be much more okay with it if it really felt that's the path they wanted and not they caved to; Still not Right but not yknow... As bad.)