Photos like these will always be a part of the PR that goes along with being president. I'm sure they're planned weeks/months ahead of time, and
seeing the picture of their school in the national spotlight is a big thrill for the kids at whichever school's involved. I don't blame either Bush
or Obama for engaging in such photo ops.
However...
The big difference between these two, and the fallacy of the OP, is that Bush' photo op coincided with a direct terrorist attack on US soil, in which
neo-cons are heavily suspected of playing a role in, and even after being informed there was an attack Bush continued to sit there with a blank
expression on his face. It reeks of having been
planned in such a way to give Bush an excuse for not being in Washington when the event went
down.
Obama's photo op took place days after the event you're connecting him to (the tsunami in Asia), a
natural disaster we can be pretty certain
no human caused. He's already committed a number of navy ships, troops, and now an air force base to be used as a forward operating area.
A better comparison would have been between Obama and Bush after the tsunami of 2004. Here Bush was slow to respond and was accused of providing
little aid (in fact the US had given 2.4bn in aid). The biggest mistake Bush made then was to set up a
rival aid organization to the UN, one
that had no track record or ability to deliver aid, while taking much needed resources away from the established organizations (it turned into a
spectacular failure), something that was profoundly misguided IMO (see:
Tsunami 2004 [scrolldown]).
While these criticisms exist about Bush and the 2004 tsunami I don't agree they are always fair, there is no single entity in charge of responding to
worldwide disaster, in every case it's always an ad-hoc response, usually with the US, Britain, and other Western powers playing a leading role. Even
so, Bush at that time wasn't the president of Indonesia anymore than Obama is the president of Japan.
I don't agree with you OP that using the photo of the school visit now is somehow "tacky", especially if it allays some of the obvious
fear-mongering going on (in particular those fake "fallout" maps). People will criticize Obama no matter what he does, it's "Obama derangement
syndrome" just as it was "Bush derangement syndrome".