S.L.J Donald Trump's Wall

I think that Donald Trump's wall is a totally bad idea. It won't help because the Mexicans can just did under the wall or fly over. In a war it will only help a tiny bit. It is racist, why can't he just get along with them. It is hardly likely that the other side of the wall will attack. Donald Trump is really racist so there is no life treating reason for the wall to be there.