It all seems very simple and straightforward. You allow parents as much choice as possible in terms of figuring out where their children should go to school, and they will respond by placing their children in schools that they want them to attend. It is simple, elegant, and makes a lot of sense to most people. Unfortunately, that is not always how it works in practice.
Vice-President Mike Pence is one person you could ask about how voucher programs have worked out. While he was still the Governor of Indiana, he pushed for voucher programs to open up the amount of choices available to students in that state. It did not go so well.
The ACLU reports that not only did most of the money from the state-funded program go towards students who likely would have attended private schools in the first place, but it turns out that it did not improve the grades of the students who ended up going to private schools either. They did not see some dramatic change in the station in life as a result of the program. It did drain some resources from the public school system though.
A lot of people who back school choice programs such as the Vice-President and the current Secretary of Education Betsy DeVos were cheering the opening up of the possibility for more and more students to have greater amounts of choice in where they go to school. At the same time, they did not highlight the numbers that are coming out of those educational changes. Perhaps this is because their ideas seem better on paper than how they typically work out in the real world. When the programs saw the light of day, we see that they do not particularly work out so well after all. There is a lot to be desired, and a lot of students are being left behind in the system.