This violence has led the US and UK governments to express ‘concern’ and when the US expresses concern about the actions of the government of an Arab country, one has to fear, given recent history, that bombing will soon follow. The warmongering editorial board of the Washington Post is already demanding that Obama take action in Syria, though not specifying its precise nature.
There is a considerable lobby in the US that seeks the overthrow all the governments in the region that are perceived as unfriendly to the US and Israel and make them into client states. Syria is not too friendly to the US but not too hostile either (it has been of use to the US in torturing people on its behalf) and it has no oil, making it not that desirable a target for attack. The Bahraini and Yemeni governments are also launching brutal attacks against their own people but they are seen as allies and that should forestall any attacks, or even harsh criticisms, against those countries.
Creating a client state in Iran is the prize that the warmongers really seek which is why the slightest indication of Iranian involvement in another country is trumpeted as a sign of its malign intentions. Saudi Arabia has actually sent troops to Bahrain to lethally quell the protests there without any remonstration from the US. But if Iran were to send in troops to aid (say) the Libyan government, all hell would break loose.