Why do leftists blame the gun, but not the shooter; and blame the drug user, but not the drugs?

We've all heard the leftists say that it's not the fault of the drug runners pumping drugs into America, it's the fault of the demand for drugs.
So sometimes it's the humans fault and sometimes it's the inanimate object's fault?
Of course I think this is all about blaming Trump for everything. If Trump announced today that he was going to demand more drugs flow into the country, even the most liberal politicians would be out shooting Venezuelan “fisherman.”
Why do leftists blame the gun, but not the shooter; and blame the drug user, but not the drugs?
Why do leftists blame the gun, but not the shooter; and blame the drug user, but not the drugs?
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