So... let me get *THIS* straight. Now you are changing the meaning
Dissension was unpatriotic.
But the quoted article said nothing about dissenting/opposing views being unpatriotic:
Drowning out opposing views is simply un-American
So we change that sentence to say:
Drowning out opposing views is simply unpatriotic.
DROWNING OUT OPPOSING VIEWS is unpatriotic!
So... explain your side again? Please, I'm a bit confused.