Why are pro-gun Americans so worried about Obama taking away their guns? Do they know how politics works here?

You're right. But for some reason they still start panicing every time someone even mentions guns. Or when a bloody shooting occurs somewhere that gets into headlines, they're already predicting what's going to happen; "they're gonna try to take my guns away". Obviously this never happens. Any kind of attempt to stricten the gun laws, like you said is poison.