Europe cares about its people so much it takes away their ability to defend themselves and lets them slowly poison themselves with drugs.
To be frank, very few countries in Europe have legalised any drugs for fun other than tobacco and alcohol, and you can't kill somebody else with a drug - whoever you kill with drugs, it's fully their fault, not yours, since they consented and said yes, I want to ruin my life with drugs. With guns, there all too often isn't consent.