Except these warrants aren't granted for "any reason" and I'm fairly sure you know that as well. Like I implied in my comment, the government is not some monolithic entity where all government employees conspire to deprive you, John Q. Public, of all of your rights.
My claim is only that no matter how well implemented a program may be, certain individuals will still claim corruption where none statistically exists. The whole point of our society is to implement laws, execute those laws, evaluate if those laws are having a positive affect on mitigating the problem it's meant to solve, and change the law to address shortcomings or unnecessary bits.
Of course we should all be skeptical of the process, but arguing against change because we don't feel like the results are going to be what we like is irrational. Past behavior is important to keep in mind but let's not exaggerate and wax hyperbolic. It's simple: If our elected officials aren't implementing and reevaluating laws based on evidence/results, then it is our responsibility to remove those officials from power. If the roadblock to removing those in power are your fellow citizens, it's your responsibility to help gain consensus in your community.
Tearing down, or dismissing, the system is not reasonable; that's partly how in US politics we've become so polarized. People don't have patience anymore for conversation or debate; they want immediate and immaculate change with 100% certainty and that's unrealistic. Change is gradual and is never going to get it right out of the gate.
So come on, if you're French, engage with your community and your elected officials to ensure that this law is implemented (or retracted) as honest as possible and stay engaged. Opinions without reasonable action is how fascism takes hold. I'm not sure how this law will turn out but I'm willing to be surprised that it gets implemented honestly. And if you're not French, well, then I'm pretty sure yours and my opinions on how that citizenry chooses to govern is none of our business (outside of gross universal human rights violations and this is nowhere near the same galaxy).