[quote=@Intrepid]
<Snipped quote by Legend>

I can’t protect Isaac, or Dad, or Ruby, or Techi or anyone from what they want, though. I can’t stop anyone from fighting the good fight for all of Existence, even though I wish I could.
[/quote]

My dad says that his priorities are us, then the Earth, then Existence. If protecting the latter would stop him from protecting the former, then it's not worth protecting.