[hamandcheese]

> All of my desktops and servers and laptops each have their own firewall

Sure, but there are plenty of devices on my network that I don’t have that sort of control over (i.e. my light bulbs).

[geocar]

Get different light bulbs; My light bulbs require a password and route-filter. If yours don't, your firewall isn't protecting you if your computer can reach them because someone can just send you and iframe that pokes your light bulbs.