Hi, and welcome!
You might have to dust off your Al-Anon tools and work on detaching (with love) from your husband. However much you disapprove of his enabling behavior, you don't have the right or ability to control him, any more than you can your son. I'm sure it's incredibly frustrating to watch that dance they are doing with each other.
My own ex-husband (recovered alcoholic for 31 years) is a bit of an enabler of our older son, who doesn't have substance abuse issues but does have some basic maturity and personal responsibility issues. I will give my opinion about things, but beyond that I keep my mouth shut. Their relationship dynamics are between them. I don't have the right to dictate what they work out between themselves. I basically stay out of it.