Tin cans are versatile, useful items, and definitely worth keeping. Almost everything is worth keeping for one reason or another. The vision of your loved ones dying is an incredibly strong motivation. Modern medicine can be supplemented or replaced with traditional medicine more times than not. Penicillin for sheep is identical to penicillin for people.
Spiders are desirable in the garden.
Leave them alone. Honey never spoils. Hot sauce never spoils. Knowledge is power. The IRS is NOT invincible.