I guess the interpretation is that while we tell him "do this" or "do that" it's ultimately up to him to listen since these aren't even persuasions or anything like that. But those options do all come across as very inconsiderate and rude given what's at stake so I thought that was incredibly strange as well...no idea if it's a bug or if there's supposed to be more options there but at least for now it seems like those are the options possible. As for responsibility for the decisions made there is a lot of that to go around in the game...plenty of instances the player decides something or persuades a companion to do something but afterwards half the conversations options are "why would you do that?" "I can't believe you did that", etc. Hopefully some of those will be touched upon in patches. But this one specifically seems like it needs a conversation option that is a little bit more respectful of Wyll.
Still in terms of the game content there is a clear best option I think.
Having Wyll save his father leads to more story content and a massive dungeon quest that leads to another massive plot twist revelation about the main story of the game and some incredible legendary items. Obviously the implications for Wyll are terrible but at least once across all your playthroughs this is something you should do imo.
