James 1:12-18 says:
12 Blessed is the man who endures temptation; for when he has been approved, he will receive the crown of life which the Lord has promised to those who love Him. 13 Let no one say when he is tempted, “I am tempted by God”; for God cannot be tempted by evil, nor does He Himself tempt anyone. 14 But each one is tempted when he is drawn away by his own desires and enticed. 15 Then, when desire has conceived, it gives birth to sin; and sin, when it is full-grown, brings forth death.Here James seems to systematically lay out how sin originates and leads to death. He even goes so far as to state explicitly that God does not tempt, and God remains conspicuously absent from the entire process. James does not say, "God decrees that a sin will happen, but takes no part in it, and then allows the agent to carry out that sin of his or her own will that God determined."
16 Do not be deceived, my beloved brethren. 17 Every good gift and every perfect gift is from above, and comes down from the Father of lights, with whom there is no variation or shadow of turning. 18 Of His own will He brought us forth by the word of truth, that we might be a kind of firstfruits of His creatures.
Note that I am not saying Calvinists think God tempts. They clearly do not. But they think that God at some point has determined that a temptation will happen, which in my view simply moves the causality of the temptation back one step. That would work against James' contention that good things come from God without "variation or shadow of turning" (v 17).
Seeing as how James never includes God in this progression, and how explicit he is to say God in no way tempts anyone, I contend that the Arminian position that God simply allows the sin of man is the correct position. Man's sin originates in his heart due to his own selfish desires. God has not fore-ordained or decreed in any manner that sin would happen, otherwise God is libeled as the ultimate cause of that sin. God, as He exercises providential sovereign care over His creation, must allow the sin to happen if it is to happen, but He is not in any way the cause of that sin.