> do you often meet people with weapons in public in the US?

In many US states you can assume that people you walk past may well have a handgun under his jacket or in her purse.

> In fact, I met much more people with firearms in public in Israel.

In Israel 1) conscripts don't keep their weapons loaded (you can often see the ammo kept hanging separately outside), and 2) anyone with a weapon has received strict training on weapon safety. Gun ownership in Israel is not really comparable to the USA.