Whenever your reading comprehension fails you, you can use tools like AI, like I did here:

Prompt:

Can you deduce from this text what someone's reason for commenting in an American forum really is?

This is the text:

"Yeah, and I’ve explained my reasons for commenting on this forum several times. But judging by the replies, people seem more inclined to think I’m either a paid shill or some leftist idiot posting from his mom’s basement.

It seems like Americans just can’t wrap their heads around someone genuinely stepping outside their bubble to engage in real debate with the other side. It goes against their entire believe system"

Answer:

From the text, the person's reason for commenting on the American forum appears to be a genuine desire to engage in meaningful debate with people who hold opposing views. They express frustration that their intentions are often misunderstood or dismissed, with others accusing them of being a "paid shill" or a "leftist idiot." The individual seems to believe that Americans struggle to accept the idea of someone stepping outside their ideological bubble to have constructive discussions, suggesting that this behavior challenges the prevailing belief systems in the forum's cultural context.

Their motivation seems rooted in fostering dialogue and challenging echo chambers, rather than promoting a specific agenda.