Legal Question in Civil Rights Law in Texas

A single, professionally written email asking them to consider additional safety protocols would likely not cause any problems for you. You have the right to petition the government under the First Amendment which would include public schools.

That said, I would not count on a single person's email to have a serious effect. You might be better served organizing larger groups to call meetings with school or district staff, attend PTA meetings, run candidates for the district, etc.