This is some great information! I've always viewed this as a more complex, multi-variable problem than the mainstream media would like to disclose. To me, the most predominant variables in the equation seem to be not only psychiatric drugs but also single-parent homes and inefficiencies upholding existing regulations.
It can't be ignorance that gun control is always pushed by lawmakers, those donation numbers might be an indicator. The bigger our government is, the more corruption they invite. This is the price of crony capitalism which can only thrive when the federal government has become too large.
Perhaps in place of anti-depressants we can clone Jordan Peterson and have him do therapy for everyone who is clinically depressed :)