Why? If some argument reduces to an elementary logical error, then it is refuted
That is all well and fine and good, as far as it goes.
But people aren't created to be Dr. Spock's. There is something even in the midst of the erroneous debates common to Arminianism vs. Calvinism which reflects the God-image quest of man to understand, to know, to believe, looking at reality as a whole. That is why Aquinas' insight, as important as it is logically, is by itself only dry bones.
It seems to me that Calvinists rely on the writings of Aquinas to justify their extreme position on predestination and total depravity, rather than using the Bible to develope their position. One thing is for sure, if one is looking for an example of a person who possessed joy and an abundant life in Christ, John Calvin would be a poor example. One can hardly picture John Calvin singing while being shackled in prison as Paul did. Calvinists are not permitted to be happy, at least that is the case with the Dutch Calvinists. To be happy is a sin because happiness obviously must mean one does not understand the depravity of ones life.