Iowa isn't bad at all compared to other places....this is going to sound weird to many, but there's too damn many people here (even in rural areas).
I grew up in central North Dakota...county was 1400 square miles and only around 2,400 people total, 9 bars spread between 6 towns that were each 10-20 miles apart, 30 miles of interstate and only 2 other paved highways, 1 highway patrolman for the county that stuck to the interstate and two town cops for the county seat. Gravel roads that everyone knew well; you could literally get anywhere in the county on gravel if you knew what you were doing. Area immediately adjacent in surrounding counties was the exact same. My friend had a suburban, so we'd pack 10 people in that thing and never see another vehicle all night.
Not saying it was smart or safe or acceptable, or that the lack of perceived risk didn't have any terrible consequences, just saying DUI was and is much more prevalent in other areas.
Same here, mine was 3 months after I turned 21.....looking back it needed to happen to me at the time. Haven't done it since and fully realize how damn lucky I was not to have hurt/killed anyone else.