Why is the left opposed to school choice?

[True Federalist (진정한 연방 주의자)]

At least in this state, the school choice plans that have been floated have mainly been plans that could be taken advantage of only by those who can already afford to send their kinds to private school because they fail to provide enough to allow those who can't afford private schools to do so.  Thus they are plans that gut the public schools the poor go to and give benefits to the rich.