So Donald Trump wants to ban muslims from entering the US does he?
Perhaps he really is not only a vicious racist but also as gormless as he looks in the photo (apologies for those of a sensitive disposition). There are others who have covered why banning muslims from entering the US is morally wrong, and if you do not understand why that is so, then explaining here is not going to make things any clearer.
But in addition to being morally wrong, it is also dumb in the extreme. There are two important question to ask when looking at a policy …
Is It A Practicable Policy?
Islam is a religion and is not apparent from someone’s appearance. There is no label on their forehead!
So a policy of restricting muslims would be limited to either asking them. Which would lead to a situation where you were excluding muslims who do not lie about their religion, or in other words you are letting in the kind of muslims that you should perhaps be excluding, and excluding the muslims there is no reason for excluding.
Or you could do some sort of racial profiling, which amounts to not excluding muslims, but excluding light-brown skinned people. Again this will exclude the kind of muslims you do not want to exclude, whilst allowing through ones up to no good.
Will It Accomplish The Mission?
It really depends on what is intended by excluding muslims. If it is intended to portray the US as an intolerant country blundering around with incompetent measures that do more to annoy than to protect, them yes it can be said to accomplish the mission.
If however it is intended to make the US safer from terrorists, then no. Terrorists are more interested in accomplishing their own mission than telling the truth, and will go out of their way to avoid being identified is muslims if they think that this will help in their mission.
There is one small category of terrorists that this may protect against – those who are initially ordinary muslims but who later become radicalised whilst in the US. However having said that, the likelihood that this measure will protect against those vulnerable to becoming radicalised is pretty low.