President Donald Trump last week began demanding that schools open in the fall. It’s a successor to his demand last spring that the economy reopen full throttle, and it looks like it will be similarly ignored.

Both are excellent goals, of course. Lots of experts, from pediatricians to economists, stress the importance of students returning to class. But as long as Trump’s safe-schools planning consists of an all-caps tweet, the president is unlikely to convince a few crucial constituencies — principals, teachers, parents — that he has their best interests at heart.

Only 12.4 percent of school principals say they are “extremely confident” in their school or district’s ability to “preserve the health of staff and students” if school opens in the fall, according to a survey released last week by the National Association of Secondary School Principals. Another 22.8 percent felt “somewhat confident.”

Imagine the delight of parents and teachers upon learning that their school principal is “somewhat confident” of keeping disease and death at bay. Now consider that the majority of principals can’t muster even that lukewarm endorsement. More than a third of the 1,450 principals who responded to the survey reported feeling “somewhat unconfident” or “not at all confident.”

Principals and health officials are not the only ones lacking confidence.

In a USA Today/Ipsos poll in May, when the pandemic outlook was brighter than it is today, 87 percent of teachers said they expected difficulty enforcing social distancing among students. A robust 18 percent said they would quit working if their school were to reopen. Among teachers over age 55, that rose to 25 percent.

So the majority of principals express limited confidence in their ability to keep schools safe, and almost one-fifth of the teaching corps said in May that they would abandon their jobs if schools reopen.

OK. How’s it going with parents?

According to a parallel USA Today/Ipsos poll taken in May, 47 percent of parents with at least one K-12 student) support a return to in-person schooling before there is a coronavirus vaccine.

If schools reopen in fall, 59 percent of parents said they would likely pursue at-home learning such as remote school or homeschooling, and 30 percent said they would be very likely to do so. In a national survey of Hispanic parents and grandparents conducted this month by Latino Decisions, 53% of Hispanic parents or caregivers said they are considering not sending their children to school or childcare this fall even though 83% are worried that their students are falling behind.

It’s surely true that millions of parents are desperate to send their kids back to school, and many teachers and administrators are equally desperate to resume their vocations and a normal life. No doubt many would grasp at anything resembling a coherent plan from the White House. No such plan exists.

Francis Wilkinson writes editorials on politics and U.S. domestic policy for Bloomberg Opinion.