I agree that there are several reasons why solving the value alignment problem is important.

Note that when I said that Bostrom should "modify" his reply I didn't mean that he should make a different point instead of the point he made, but rather meant that he should make another point in addition to the point he already made. As I said:

While what [Bostrom] says is correct, I think that there is a more important point he should also be making when replying to this claim.