[It's only a matter of time, bro. You're going to have to let that pressure go eventually. Remember, it's okay to cry.]

Everyone makes mistakes.

[Tadashi looks up at that sniff, any remains of that offended expression draining away as he looks at his little brother. He's certainly not going to lie to Hiro. Absolving him of all guilt would only be doing him a disservice, but the kid's punishing himself over what happened more effectively than Tadashi ever could.]

... There were a lot of things that led up to what happened with the dock. Lots of mistakes, big and small, and you can't carry all of them. Not on those skinny shoulders. [He smiles, a brief, but natural reaction while in the presence of his little brother.]

You made mistakes. I made mistakes. Callaghan... well, he's made a lot of mistakes. If we're going to move on from this, the most important part is identifying those mistakes so that neither of us repeat them again.

["Neither", because trying to include Callaghan in this little self-improvement exercise, even verbally, seems pretty silly.]