Here is the scenario (I understand this is happening in the US but I have not confirmed anything):

A private organization gets together and obtains private donations to fund their program. They advertise that they will pay men and women over the age of 18 $300 to voluntarily have themselves sterilized if they are active drug abusers.

They do not recruit, they advertise. They do not approach anyone, the drug abusers read the advertisements and go to the program on their own. They must prove they are active drug abusers, they will be paid $300 for submitting to the procedure of being sterilized. They will never be able to have children again.

The medical procedure is done by licensed medical providers in a local hospital with all the advantages of modern medicine. The procedure is paid for via private dollars, not tax dollars.

Is this morally objectionable or the correct moral decision?

Most of the takers will not be those who top the IQ charts. They will take the check, but years later after they get off drugs, they can sue. They will claim that they were baited into accepting the money, and that nobody fully explained it. The state will be forced to pay for fertility treatments. It happens!

I am in favor of sterilization for all. The world is too crowded as it is. It is true that anyone can reproduce, but just because you can does not mean you should.