Because there was a national uproar about it. I would be willing to bet he comments on this if there is one as well.
The "national uproar" as you put it was brought about by race hustlers, and news outlets bent on promoting the Obama/Holder agenda of racial dividing for political gain. But your question was in why should Obama comment on this situation, and I would say that we have a situation where Obama is now using the Bush doctrine to go after the terror army ISIS, a known morph of AQ, whom he said they had decimated, and all but killed (which was a lie ofcourse). You can find the hypocritical truth of that by simply asking yourself why he doesn't say a thing about the hundreds of black on black shootings of a similar nature in Chicago every year...Not a peep from him on that Nooooo. Why? Because it wouldn't have furthered the false narrative that America is still a racist nation...Which ofcourse is just a cover for him to dodge any criticism for the terrible job he does as President by being able to evoke racism at any criticism.
There are an average of 44 murders per day in the United States (by far the highest in the developed world). Everyone of them is a tragedy. Do you want the president to address the nation for each and every one of them? We kill each other in this country at quite a rate. Hell more people die from murder in any given year in this country then terrorists would killed in at least a couple of centuries.
Man, when you progressives are wrong you are really wrong....
"Washington (CNN) – As terrorism increasingly becomes a tactic of warfare, the number of attacks and fatalities soared to a record high in 2012, according to a new report obtained exclusively by CNN.
More than 8,500 terrorist attacks killed nearly 15,500 people last year as violence tore through Africa, Asia and the Middle East, according to the National Consortium for the Study of Terrorism and Responses to Terrorism."
Terrorist attacks and deaths hit record high, report shows – CNN Belief Blog - CNN.com Blogs
Now this is the total of murders in the US in a given year...
2006 2007 2008 2009 2010
Total 15,087 14,916 14,224 13,752 12,996
EconomicPolicyJournal.com: How People Are Murdered in the United States
Now by looking at this even though the numbers are 2012 for terrorism, and 2010 for murders, they represent the latest numbers out by these organizations, and even comparable in amount. But, the number of terrorist killings in the world at this point in time outweighs the number of homicides in the US. So we can conclude about your statement here that either you pulled the number out of your arse, or are just plain out lying about it in order to diminish the state of war Obama has us in today, against the enemy that has called for exactly this scenario to occur. Either way, it is a bogus argument.