I might be wrong, but doesn't the reason boil down to the fact you don't want to lose your only brother?
[Look, he's not advocating that he lie to Tadashi, but if Hiro doesn't want to tell him he's dead, then they may as well dig deeper and focus on the heart of the matter.]
no subject
[Look, he's not advocating that he lie to Tadashi, but if Hiro doesn't want to tell him he's dead, then they may as well dig deeper and focus on the heart of the matter.]