All disagreements come from poorly formed arguments
but
score: 3
Sometimes it's impossible to get through to someone, no matter how well thought out your argument is. This is usually the case with Religious fanatics, who are beyond reason.
Even if you formed the perfectly written argument without any fallacies, people can choose to ignore it and further disagree with you. It's not reasonable, but still happens.
People's pride also leads to disagreements. Many people just can't handle being wrong ,and choose to ignore or not accept any arguments contrary to their beliefs
If an argument contains a detailed description of every term, its boundaries and usage within this context then the argument is self-sustained. Disagreement would focus on if the wording is correct and how close it is to the original intention of the author unless it contains a logical fallacy.