Rava,
You have police in the town, county and state where you live. They are ” big brother “. (We actually do not need to reference “1984” in this discussion.)
The country you live in has a military. They are ” big brother “.
They protect you.
Jews in countries with strict gun laws rely much more on ” big brother”.
The Jewish idea is to be mispalel bshlomah shel malchus and if a county descends to ish es rayahu chayim blao to leave it.
There is absolutely no jewish idea that every citizen must have assault weapons. If you can find me a source , I would be happy to hear it.