What is the most likely reason Northerners were upset about draft guidelines?

Northerners were likely upset about draft guidelines during the Civil War because they felt the rules disproportionately favored wealthier individuals who could afford to buy substitutes or pay for exemptions, thereby placing the burden of military service on the lower classes. This perceived inequality fueled resentment and protests, as many believed that the draft was unjust and unfairly targeted the poor. Additionally, the high casualties and the increasing demands of the war intensified public discontent with the draft process.