Senku has every right to be upset about it. Dire is definitely what Dennis would call it too.

"If that was happening back home for me I'd be proper pissed too. Nothing selfish 'bout it." Not at all. Selfish is this train thing stealing them away from their homes and using them to save other worlds without any consideration of what they already were dealing with. It's bullshit.

There weren't better equipped people to handle this over seemingly random assholes kidnapped into a space train against their will?