It's not true that white males are responsible for most mass shootings.   

The proof is a comparison of the number of murders by radicalized Muslims in the last 10 years.  Compare that to the number of murders by white males, and your claim completely falls apart.

If X represents the number of mass shootings by white males, and Y represents the number of terrorist attacks by radicalized Muslims (which number in the thousands), then it seems wise to deal with X, rather than X + Y.

X + Y is a senseless compounding of violence crime.

In other words, on what basis does it make sense to reduce the security of American citizens?  White people do it, so it's okay to let in the radicalized Muslims (and btw, they are committing far more mass killings than white males are in the U.S.)

One terrorist attack is one too many.