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You appear to be talking about laws of science, philosophers distinguish these from laws of nature. Whether or not there are any laws of nature is a matter of dispute, and if there are, what manner of thing they are and whether or not they could support a determined world, are also matters of dispute.
On the other hand, there clearly are laws of science and they allow us to manipulate the world to our advantage. In short, they're a bit like recipes, so it's quite puzzling that they would strike anyone as a reason to doubt the reality of free will. But, assume that we can take a complete and exact measurement of the relevant state of the world, at time zero, and have the calculating power to predict how the agent will behave at time two. At time one, we tell the agent what they have been predicted to do at time two. Unless the prediction is something quite trivial, like "the agent's heart will beat", the agent can countermand the prediction. And we are committed to this, because countermanding the prediction is logically equivalent to observing it, and the sciences we appeal to for the relevant laws are dependent on observation, so we cannot simply rule out an observation which conflicts with our thesis. The consequence of this is that no law of empirical science can ever cast doubt on the reality of free will.
The randomness which conflicts with determinism, is mathematical randomness. In principle, a determined world is fully computable, this has various consequences and explains, inter alia, the present popularity of Zuse's thesis with determinists.
In classical mathematics, the probability of a real number being computable is zero. This means that the continued expansion of a string generated by non-algorithmic means, has a zero probability of being computable. We can construct such a string from controlled voluntary actions. For example, append, in sequence, to "0.", a "1" for any word written by me in this post, that has an odd number of letters and a "0" for any word with an even number; 0.100011001 etc. It would be begging the question against determinists to say that this string is random, but it is sufficient to show that there is no logical difficulty for controlled voluntary actions which are mathematically random.
It matters in exactly the same way that evolution matters. The denial of free will is at least as irrational as the denial of evolution, both are observable. If we deny that which is observably the case, then we have no non-arbitrary way in which to talk about the world. Human beings are social animals, so they need to be able to communicate, and this requires that they have a world which is common to them all.
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