How can Ezekiel 20:25-26 say God gave Israel laws that could not save and had them offer their firstborn by fire?

In the Old Testament you get many instances where the people do things themselves and God more or less takes credit for it. A parallel is Exodus 9:34, where Pharaoh hardened his own heart, and two verses later, Exodus 10:1, where the Lord says he hardened Pharaoh's heart; that is the mystery of God's foreknowledge and man's free will stated explicitly. The same thing is happening in Ezekiel. The people decided to put their firstborn to death in worship of Molech or some other foreign god, and God says he did it because he is intimately involved in giving or withholding grace depending on how men decide toward him. We cannot do anything good unless God gives us grace, and he can justly withhold grace when we show we will not obey him, so in that sense God can take credit for what happens, and he is just in doing so. As for giving them statutes that were not good, they did not want to obey God from the heart, to simply love him and love their neighbor, which sums up the whole law; they wanted laws, so he gave them burdensome laws, tied to endless sacrifices and rituals, as a judgment on their refusal of the pure life he wanted for them.