No, that is not true. There are many statistical results in the social sciences that are robust and have continued to hold out of sample. The underpreformance of IPOs is one that comes to mind immediately. There are many others.
Hence, Donohues results are also 'highy suspect'.
Yes. Thus, we have a silly circular argument.
Not at all. It meanse that the overall effect on crime of CCW is too small to be discerned by conventional econometric analysis.