Sanctions starve people to death, literally. There is a blockade on food, medicine and your entire life savings turn to nothing. Your life becomes rations. It has such a significant effect that this even turned the non-religious Arab nationalist socialist Ba'ath party into an extremist Islamist brigade in under a decade[0].
These sanctions are even one the major stated reason of the 9/11 attacks by Al Qaeda[1] - not that Saudis flying planes into the world trade center somehow represents the suffering of Iraqis.
I'm not even sure why this would be contested, I don't think you understand what sanctions are or what kind of almost-genocidal effects they have[2] but with your comment I'm suddenly understanding the reasoning of the people downvoting me and upvoting others.
[0] https://en.wikipedia.org/wiki/Faith_campaign
[1] https://en.wikipedia.org/wiki/Motives_for_the_September_11_a...
[2] https://en.wikipedia.org/wiki/Sanctions_against_Iraq#Effects...