Nutcases happen randomly, but when one particular demographic is 123 times overrepresented in terrorist killings, then only a fool chooses to ignore that connection.
As for gun control, it may be a good idea but its kind of merely treating the symptoms, not the cause. Muslim extremists are still extremists, no matter if they have guns or not. Religious extremism is what needs to be addressed here, thats the root cause.
Gun control is illegal until second amendment changes. As much as I believe gun control could help reduce the deaths, it needs to be done legally. If Obama really wants to crack down on guns, he should call to change the second amendment, not try to dishonestly sidestep the constitution. Otherwise its just empty rhetoric, IMHO.