This is a drastic oversimplification of what the USG believed about al-Awlaki. CT officials in the US believe al-Awlaki to have had direct roles in the "underwear bomber" passenger jet attack and an attempt to blow up two cargo jets with PETN. He was indisputably a counselor to Nidal Hasan, who murdered 13 people at Fort Hood.
In sum, the USG and UK believed al-Awlaki to have been Osama bin Laden without all the money, operating from a secure location in Yemen, recruiting random people from around the world to conduct horrible crimes in the name of AQAP.
It does a grave disservice to the tradition and, one supposed, the very concept of "dissent" to equate the coordination of murderous large-scale attacks on civilians with "dissent".
Sharing this belief with the USG does not require someone to believe that it was justifiable to assassinate him. But you can believe assassination to be wrong without glorifying its victims.