Because this is a topic about Patriotism and who is actually going to help my country. And building a culture that encourages people to help my country.
but outside your bubble
I'm happy with "Americans" being my bubble. I honestly don't need to care about others, and as you point out there's plenty enough to worry about if we keep it to Americans alone.
SMBC-comics is obviously itself an American comic strip as well (A PH.D who lives in USA in any case), so you're coming over here to talk about an American comic, talking about American issues that's bringing up American political discussion and... like shitting on it? Okay, no one asked you to come over.
Now my question to you is: what are you doing in this topic? Are you seriously trying to discourage me from improving the country where I live? Or are you trying to say your country is better or something? I don't even know what your perspective is.