I can't vote on this, because both points of view are valid.
The fact is, statistically speaking, someone who commits a particular crime is more likely to commit it again than someone who hasn't committed it doing it for the first time.
A man who punches someone, once, might do it again. Whatever circumstances and stresses led him to throw a punch, whatever provocation he was given, who is to say he won't be faced with a similar situation again? It's reasonably likely he will respond in the same way again.
A drink-driver like yourself, your car insurance will be higher when you get your licence back simply because a person who is so out of control as to either think drink-driving is OK, or that they are too skilled a driver to have a problem, or they just don't care, is more likely to drink-drive in future than someone who has never done it.
You say you are sober, remarried, in a job and "won't" do it again, but you can't be certain you will never do it again. What happens if you lose your job and your marriage breaks down? What's to stop you having another "full on mental breakdown" (your words) and start drinking again? Nothing. You might think you've had all the therapy and treatment you need to never make that mistake again, and I hope you have, but none of us can predict the struggles we will face in future.
FWIW I once employed someone who tried to hide their drink-driving conviction on his application. When I pushed him to disclose it he made all the excuses (stress, one-off mistake, only marginally above the limit). I gave him the chance and soon regretted it - the excuses he gave to try to excuse his conviction were a forerunner for all the excuses he gave for why his output was so poor.
FWIW (2) I'll never be allowed to own a shotgun. I have suffered (still do) with depression all my life and attempted suicide. I don't consider myself a risk to anyone else, currently I don't consider myself a risk to myself either. But if I want a shotgun licence, I will be judged on my past and will be rejected. Unlike you, I haven't even done anything wrong, but I am still treated differently because of events in my past.
It's just the way it goes.