Well, on some level they are related, as you noted, by the ideological background that drives the belief system of the people managing SF. But, if we range their decisions by the amount of harm they are doing to the city, I don't think not jailing addicts would come on top. There were other places, where this strategy worked successfully - when combined with suitable addiction management programs and proper law enforcement in other areas. SF management, obviously, is unwilling to do that, but I would blame the whole complex of delusionary beliefs they hold rather than specific decriminalization decision.