Sterilization is quite a bit different from abortion.
An abortion is a choice not to have a child. Sterilization is a choice to permanently alter your body such that you can never have children.
A doctor talking to a patient to ensure they understand a procedure and it's consequences and that those consequences are what they want when those consequences are permanent is just responsible.
It's entirely the patients decision, but that doesn't mean the doctor shouldn't confirm their intent.
I don't know why you'd disapprove of doctors making sure patients understand the consequences of a permanent procedure before agreeing to do it.
Hell, we expect tattoo artists to make sure people want the outcome they're asking for before putting ink to skin, and to refuse if they think you might not be thinking clearly. (Most won't actually tattoo drunk people for example).