No you don't.
There are things I trust my son's teachers to teach him and then there are some things I make sure I teach him myself. If a parent is involved enough, they really don't have too much to fear from teachers. That's MHO anyway.
What the schools are trying to teach parents right now is that they shouldn't allow their children to play with toy soldiers, action figures with any kind of weapons or even GI Joe. If a child plays with toy guns, even squirt guns or bubble guns, then they are likely to slip up at school and continue their pretending. And when they do, boy oh boy, are they in big trouble.
It's insane. It's one thing when another child actually threatens another child, like biting, hitting, etc. But to talk about play guns or pretend they are action heroes is perfectly normal and should not be punished. These absolute rules lack common sense and they will do nothing to curb real violence.
It's gone too far and this effort to ban all mentions of any kind of weapons, even toys, are all designed to get the public to obey the new liberal rules. They think we should all be against gun rights and are messing with our children's minds to control what they think.
The schools are way out of line to punish this child. Others have been suspended for equally stupid shit. A piece of paper that looked vaguely like a gun, talking about a damn bubble gun or the kid who drew a picture of a gun in art class. It's gone way too far and the only objective is to shape the way students and parents think about guns. That is not their job and they've no right to even try.
They think placing signs stating they are gun-free zones and brainwashing students to fear all weapons, no matter whose hands they are in is nothing but liberal bullshit. They have outstepped their boundaries when they seek to dictate how children should feel about our right to bear arms.
If a child designed a socialist flag and praised the virtues of socialism or communism, they'd get an A and the teacher would tell them they are smart. If a child drew a picture of their military father who was protecting his country and drew him holding his gun, the child would be severely admonished and suspended. It's pretty clear what the agenda is of many liberal teachers.