Comment by AlexandrB

I believe kitchen knives, without good reason (being a chef is a good reason, have just bought it ditto), are already banned in public in UK.

Still, UK does have a firearms licensing process; I doubt anyone at any protest would be allowed one, but the response of UK police only escalates to "pin to ground then shoot in head" when they've mistaken you for a suicide bomber wearing an explosive vest and expect you to blow yourself up in a crowded subway train (which has happened! I don't excuse this! But this is still less stupid than claiming someone is armed after removing their weapon).

With the appropriate permit, yes. Which is also the case in Minnesota.

(The permit requirements differ a lot between countries, but that an implementation detail, you should not be killed while respecting the law)