I’m not saying that, but how many people go banzai with legally owned weapons vs those with illegally owned weapons? People use the UK, and Island with pretty well enforced borders as an example, the US has a huge land mass beneath it with a huge quantity of illegal weapons that are moved over the border in a variety of pretty sophisticated ways.
2012 I was lucky enough to spend a day with the US Border Patrol in El Centro, Southern California. Absolutely mental what crosses that border. It made me realise how difficult it is to smuggle weapons into the UK. Compared to the US we’re pretty safe.
As for the knife question, totally. Or if not he could have picked another moment to strike. Depends on the level of crazy. I personally wouldn’t choose a bread knife. The length is good to damage internal organs, but with no point it would require a fair amount of force to pierce clothing and skin. But you can buy a variety of fairly evil looking knives over the counter these days.