People have already correctly answered that in this community there are no stupid questions, you're supposed to be able to ask anything without ridicule. But if you want to permit the general existence of stupid questions, here's the definition I've always used.
A stupid question is one you can easily answer yourself.
As in, any question due to real lack of knowledge is not stupid, but if you can answer your own question just by thinking about it for a second, then it wasn't necessary to ask and therefore "stupid”.
The police are typically just there to point guns, so I'd only call if I thought a gun was useful, which is extremely rare.
e: I'm answering from the USA
but
I would absolutely change that stance if we took guns away from cops and stopped giving them military training. Especially if they had a social worker / deescalation force that was more likely to be sent.