Actually, the lack of understanding is yours, not his.
To begin with, he did not "accept responsibility" for the deaths of those pirates. That responsibility was theirs, and they accepted it the moment they attempted to seize the Maersk Alabama--this was no problematic Lindbergh baby kidnapping where there was distinct possibility of innocent men being wrongly convicted and executed. He was not a judge, nor was he a jury, and their executioners were the Navy SEAL snipers who gave them a far more merciful end than was their due.
Further, the good Reverend has a point. This was one good call, but the problem of piracy remains. As good as Navy SEAL snipers are, they are not the constant solution to what is at this point a constant problem. The pirate nests need to be cleaned out and the Somalis need to get the hint that, no matter how much poverty sucks, piracy is not the pathway to prosperity. What has the President said or done to advance that larger objective? So far, nothing.
Finally, even if the responsibility of making such decisions is awesome and weighty and all the rest....so what? Any man who stayed awake in high school history class knows at the very least that being President is not an easy job. He asked for the job anyway. If he is burdened by such responsibility, he should not have run for the office.
Of a certainty the job is weighty and challenging; a man who fails to appreciate that going in has no business sitting in the Oval Office. This incident is nothing compared to the enormity of the challenge of Iran, or the delicacy of the difficulty that is North Korea, or the complexity that is Russia. I do hope that the current occupant of the Oval Office is not as weighted down by this crisis as you suggest, for that indeed does not augur well for the real crises to come.
The President made a good call--but let's not pretend this call was major league. It wasn't. The REAL challenges in foreign policy are still yet to come.