The Law
All Arminians affirm that NO ONE can not sin. No one is able to be perfect. However, Arminians also say that human inability would imply that we are not responsible
[Normally, they apply this to election and total depravity, saying, people can’t be held responsible is they don’t have the “ability” to independently (of God’s irresistible grace) choose him.]
However, God does command us to obey Him. Furthermore, Galatians and Romans makes clear that NO ONE can be justified by the law. No one is perfect. This certainly implies some sort of inability since NO ONE is able. This is a moral INability.
[One major reason why people make up the philosophical notion of Free Will is because they assume, contra Scripture, that inability alleviates responsibility]
Therefore, Arminians affirm the same principle that undergirds Calvinism: INABILITY does NOT take away responsibility. In fact, our moral inability actually makes us blameworthy. With respect to our hearts’ condition, our having moral inability, we cannot obey God [ie. Romans 8:7-8]. Apparently, our will is not all that "free" after all.
If you disavow perfectionism, then inevitable you have to affirm total depravity and the need to irresistible, electing grace.
