People who write people off have no idea what friendship means. Friendship means being willing to lay down your life for another.

Friendship also means distancing yourself from people who insist on harming themselves - who choose drugs over friendship, and who often manipulate their friends into accepting their toxic behaviour at any cost.

You are very wrong. Just because you are friends with someone does not mean you have to accept the kind of abuse that come along with a drug habit.
Some addicts will steal from their friends to get high and no one should have to put up with that.
Respect is very important in friendship--it needs to go both ways.
Laying your life on the line for friendship is all very romantic & sounds great but the reality is you can Ben taken advantage of by your friends and you need to protect yourself.

There's only so much that you can be disregarded and blown off until you start to do the same.
I'm happy to report that they act like a normal person now that they just stick to Heineken.