Act of Terrorism?

We heard President Jimmy Carter cite the right wing as depicting President Obama as reincarnation of Adolf Hitler and they should have buried Obama along with Kennedy. President Carter referred to this rhetoric as being racist. I have even noted that Obama has been referred to as Stalin. This not only appears to be disrespectful of our President but isn't this dehumanization of President Obama? Is not this type of dehumanization the type of action that Hitler took prior to the holocaust to dehumanize the Jewish population? Has not this type of speech crossed the bounds of freedom of speech and should not this rhetoric be regarded as an act of Terrorism? I haven't heard of such inflammatory rhetoric come from Hamas which is classed as an terrorist organization. Does not this type of rhetoric increase the probability that some fruitcake or emotionally unstable individual bring great harm to the President?