The process of divorce is a serious issue, and it's not a decision that you can or should take lightly. To prevent people from making the rash decision to go through a divorce without thinking things through, you must give a good reason why divorce is necessary.
If you're divorcing a co-parent who struggles with alcohol abuse, you may be hesitant about sharing custody with them until they stop drinking. You may be torn between your wish for your children to continue to have a relationship with their other parent and your concern for their physical and emotional health and safety.
Child support is sometimes a contentious issue because one parent is left to pay a large bill each month. If they have more than one child, the amount they pay can add up to a fairly high percentage of their take-home income.