Human tendencies > Starfleet white-knighting
Ha-ha, true. I actually like that our heros, while they try to do the right thing, aren't necessarily saints all the time. They still have the same humanity, they just try harder to be their better selves.
Frankly, Kirk couldn't risk failure here. The risks were far too high.
In a way it's probably lucky that Kirk stole the
Enterprise and arrived when he did. If the
Enterprise never arrived, Kruge may have tortured David until he got the information he wanted, which could have been a profound threat to the Federation.
And I just can't see the Klingons as being the injured party in any way. In a way I'm actually surprised the Klingon Ambassador made such a stink. I'm not sure what he was hoping to accomplish other than being a major PITA. First, the Klingons violated Federation territory and destroyed a Starfleet ship. And, at the end of the day, the Klingons all died in battle (well, except for Maltz), an honorable death in their eyes. That is what every Klingon hopes for. I was glad Sarek showed up in TVH to remind everyone of that. Yeah, Kirk broke regulations and would be punished for that, but the Klingons are hardly the injured party.
Kirk, despite the fact that this man was responsible for all this (not to mention creating a completely alternate timeline), and his father's death, still offered to save him and his crew. Nero told him to stick it up his jefferies tube...so Kirk destroyed him to ensure his trip into the black hole didn't simply result in another time travel event.
Yeah, not seeing the problem here either. Kirk made the offer and Nero refused. Now, he knew full well that Nero would tell him where he could shove that offer. But if the unthinkable happened and Nero actually surrendered, then Kirk would have rescued their crew and placed them under arrest. But, we all knew that wasn't going to happen. And at the end of the day Kirk was still a Starfleet officer tasked with protecting the Federation. Nero was a major threat and needed to be stopped.
Sometimes people get so wrapped up in all the peace talk about the Federation that they forget Starfleet is also tasked with protecting the Federation. It's why they went to war with the Dominion and didn't just surrender. It's not about never fighting, never destroying the enemy, never killing. It's about the steps you take to try to avoid that if possible. Starfleet does not shoot first. They do try negotiating, try to find the peaceful avenues first. It's when all that fails that war becomes necessary. In the Dominion War it wasn't until the Dominion attacked that war broke out. Starfleet never went to the Gamma Quadrant to start a fight with the Dominion, and even when they came through the wormhole to annex the Cardassian Empire, they still didn't attack. During the war itself they made attempts at negotiating and end to the conflict.