Your post is so chock-full of unnecessary hyperbole and alarmism that it's hard to know where to start picking it apart. First of all, you don't need to look to illegal drugs to find something that's insidiously addictive and "freedom destroying"; nicotine, an already-legal and freely available drug, is as addictive as heroin (and I should point out that it's the tobacco corporations, not the government, who are profiting the most from the millions of cigarette addicts.)
Second, you're making the false assumption that everyone who supports legalization of addictive drugs also supports the recreational use of these drugs. This is not the case at all. The philosophy behind addictive drug legalization has two main facets; one is that - yes - we should not legislate what others may or may not do with their bodies. If someone wants to turn themselves into a slave to opioids, they can be my guest. Even though I don't approve, I'm not going to stop them; it's their choice, and even if they might find themselves without a choice to stop down the road, that doesn't change the essential fact that they had the freedom to inflict their addiction upon themselves in the first place. Secondly, and more importantly, it's about harm-reduction. People are going to use drugs no matter what; legalizing them would simultaneously dramatically reduce the health risks (by allowing addicts access to pure, regulated, measured doses) and positively impact society (by cutting out a gigantic source of profit for criminal organizations across the world.)
In fact, on that note, I'll show you the flip side of the situation: By allowing drugs such as coke and heroin to remain illegal, we are handing billions of dollars to Mexican drug cartels, the Taliban, and other major criminal organizations, who then terrorize local populations, bribe and corrupt government/military officials, and generally speaking threaten the very foundation of civilized life in the countries that they operate in. Are you telling me that the bloodbath currently happening in Mexico - which is costing thousands of people their ultimate freedom, life - is less important than some heroin junkie's self-inflicted "freedom destruction"?