I'm going to deal with this sensitively as I understand this issue you raised in your post.
I agree with you that once is a mistake, twice is a bit silly.
In my circumstances I was doing it so often that it wasn't a matter of 'If' I got caught but 'when'. Now that I have been caught I know in my heart I will never do such a thing again.
Now, I am going to defend 'us' because we are a statistic. As you say we are all human. And alcohol does make us do silly things. It lessens our thoughts and you don't think of consenquences when drunk.
Believe me the punishment we get after being caught drink driving is more than enough. We all go through possibly 5+ years of inconvenience so I disgaree that the key should be 'thrown away.' That should be reserved for the paedophiles and molesters of this country. I do not want to be in the same bracket as them.
However, I understand what you say that you are serving a life sentence due to the loss of your child and because of that I apologise. If you read the forum, most on here sincerely regret there mistake.