(1) the us is unsafe. (2) if the us is unsafe then it is not the case that the usa is a good country to live in. -- with modus ponens from (1) (2) -- (3) it is not the case that the usa is a good country to live in.
the us is unsafe.
if the us is unsafe then it is not the case that the usa is a good country to live in.
the usa is a good country to live in? there is too much crime in the usa.