Everyone agrees that heroin is bad.

Well, people who aren't yet in the throes of addiction to it.

To get stuck in that gravity well requires getting deluded and sliding into it.

For example, if you get distracted and take one small action that doesn't feel like a big deal, you could get stuck forever.

Small actions don't feel like a big deal, but if they pull you into a gravity well, they can capture you.

The same logic applies to all addictive things that are not good for you.