Even if we take your use of 'something', the argument doesn't hold up. Firstly, it can be rationally construed that there is something to fear about everyone. Maybe that particular 'something' isn't even directly apparent. Does that mean it is rational to fear everyone?
Second, the argument still suffers from circularity.
A: There is something to fear about X.
B: Why should I fear it?
A: Because it is rational.
B: What makes it rational to fear X?
A: Because there is something to fear.
Thirdly, the 'something to fear' aspect differs between individuals. Someone afraid of cockroaches believes that there is something about cockroaches to fear. It doesn't follow however that the particular 'something to fear' is rational. .
That doesn't explain why you don't have the same 'rational' reaction to anyone and everyone else. Your argument singles out Muslims as though they are somehow special in this 'uncertainty' respect, when the same can be said of everyone. Unless you have some means for determining 'friendly' and 'diabolical gremlin' non-Muslims, then you cannot say 'Those Muslims... I can't tell the good ones from the bad ones.' That's true for everyone: 'Those humans... if only they all wore tags that said either friend or foe.' As I've said before, you are the one assigning tags here, and you've decided that it is 'rational' to give all Muslims a particular tag, even though the very same argument that you use to make this assignment could easily apply to everyone else.
You forgot to factor in denial. Most people have some fear of Muslims on planes, but a few are in denial about the possible danger of another terrorist attack. It's irrational to feel no fear in a situation where you are confronted with a possible threat.
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