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Well, a family member used to be heavily addicted to heroine (now clean, thankfully). A good part of the 'destroyed family' etc. thing was down to the criminality necessary to fund the addiction, and it being more difficult and a higher hurdle to be open about it / get help. As the whole thing is illegal, and therefore expensive, and therefore fuelling criminal endeavours which means people tend to keep the lowest profile possible as the police would very much like to nab them.
Heroin is not a fun thing, but it being illegal is about as damaging as the addiction is in the first place.
Yes, because it is illegal.