There are such inconsistencies in this area, though I guess Ireland is different to the UK.
Someone I know was prosecuted for an accident where he lost six of his children. He overtook, driving a 4x4, went off the road to do the overtake and misjudged it and rolled into a river. He received a substantial custodial sentence. Prosecution also said some home repairs he'd done to the vehical had made it unsafe......but he hadn't realised that. He thought it was ok. He thought his overtake would be ok.
Now in my mind that situation isn't as bad as driving about on the wrong side of the road while holding a baby.....which surely anyone can see is dangerous.
I felt the bloke I knew didn't deserve to go to prison. He made an awful mistake with terrible consequences but surely losing six of his children is punishment enough? What's to be gained from him going to prison for years. Interestingly the children's mother who was there at the accident and initially stood by him I believe now blames him and is very angry with him.
Causing death by dangerous driving does often result in a custodial sentence.