The motivation for both hillary and President Bush going was essentially the same; it was done for political reasons.
I honestly believe that the difference is that it was ONLY for political purposes in hillary's case. It is well known that she despises "those who Serve". However, I believe that President Bush genuinely loves, respects and appreciates the troops.
And I think that a President that does something like this, even if there is a greater risk to life than there was, is worth the risk. It sends a heck of a strong message to the world on the courage and resolutness (is that a word?) of America and American leadership.... especially when the leaders of the "opposition" are afraid to to show their faces in public.
Face it, no politician is REALLY that important as an individual; they are really only symbols, no matter how much you love or hate the person, and the loss of any one or two doesn't mean much in a practical means, only on a psychological level.
It is the "system" that really matters, and that will go on even if some of the most important "players" are suddenly removed from the equation.
(I do however worry that the system is rotting from within, and THAT is what will destroy us as a nation.)