[sofixa]

I live in the Paris area (initially came as a tourist) and I've visited San Francisco. It's all a matter of where exactly you are - there are bad parts and good parts. However, the worst parts of San Francisco were definitely worse than the worst parts of Paris (where no tourist has any reason to come close to, unlike in SF where it's literally a few blocks away from major tourist attractions).

You don't see people shooting heroin literally 5 metres away from a tourist attraction in Paris (for the record - right next to the queue of tourists to get on the cable car at Powell/Market stop).