Kevin Jon Heller, writing on the blog Opinio Juris, recently did a great job of making the important point that while the U.S. government might be able to provide some legal justification for the continued use of drone strikes abroad, that would be different than providing a moral justification. Replying to responses on an earlier post, Heller writes:  I still want to resist an idea that seems to underly all of the responses to my post: namely, that we cannot (or at least should not) consider collateral deaths caused by drone strikes to be immoral as long as those strikes were legal.  I strongly disagree with that idea; I think it is possible — indeed important — to insist that the drone program is profoundly immoral even if…