How much does it matter what other nations think? Sovereignty of a whole nation of people matters more than the injustices of their own government. There are plenty of human rights outrages in Canada (look at what has happened to many of the Native tribes), and the US (prisons, wiping out entire Native populations - now almost extinct, what has happened to the Blacks for decades upon decades until only Martin Luther showed up).... and other nations have had plenty to say about it, but should this mean that an interventionist foreign policy be used to "correct" such injustices?
The sovereignty of a nation and the rights of those people to find their own way to a civil code based on their own moral principles has higher priority than the interlopers of other nations. While influences from other nations in order to gain greater rights by minorities in that nation, such as gay rights, etc., can be a good thing, it is only a good thing if it is done without political or economic blackmail. Often nations use such devices to further political or strategic goals, trumpeting a humanitarian cause of one kind or another. As an example, Afghanistan, has for decades been violating the equal rights of women but only until very recently did the US decide that this was a motivation to go in and "restore" those rights. What was the rest of the motivation, and why did that humanitarian cause take so long to enact upon?
And as for many of you who decry these inhumane acts, I see it as very convenient that these same people hate many things Islamic and speak of ordinary Muslims in pretty much the same breath as the terrorists. The tone of the comments here are such as, "what barbarians". Where were you when this was happening time and again for decades before your lovely cities were attacked by terrorists?