Tyranny in the USA?

The Guardian speaks of the usurpation of radical and dangerous powers in the context of drone warfare. Retired General Vallely speaks of tyrannical ways of the president. Der Spiegel warns of the demise of the political order to be replaced by a global police state. Deutsche Welle accuses the US government of illegal killings of suspects without charges and trial. Senator Rand Paul accuses the government of recklessness. President Obama laments that he is only the president and not the emperor. And Time magazine warns that one day, the U.S. will bitterly regret its course of conduct. What is going on? Are we observing U.S. tyranny in the making?