When you’re a teacher sending an email to parents in your school district you need to keep potentially contreversial stuff out of it - or you need to remove the parents from the sender list. It does not matter how slight the knock is - and this is a VERY slight knock, imo - he HAS to know that it will not be taken that way. Politics is contreversial, these days more than any other in my 41 years. ANY kind of politics will be seen as contreversial and should be avoided. That’s what I mean by “stuff like that”.
Sorry for not being more specific.