Simple - are individuals on SSRIs more likely to commit battery or assault? Be public nuisances or disturb the peace?
There is no drug that 'makes you shoot people'. SSRIs are just generalized drugs for keeping serotonin in the synapse. This has many effects, some unknown or poorly understood, but 'begin to seriously plan out a spree shooting that would not otherwise have been conceived of' can not one of them.
Sure, the efficacy of the drug in treating depression may be questioned, but its complicity in shootings is one bizarre red herring.
Bookmarks