I don't really agree. I've had my car broken into twice, none since I pointed two cameras with bright red rings of LEDs at my car.
I find it quite useful to know when a package is left at my door.
My control system for lights can make the house look lived in, but is also really handy for controlling lights where they are hard to reach.
We have no useful front facing windows, it's quite nice to know when friends/family drive up for a kid pick up, visit, whatever without having to wait for them to knock.
It's nice to know when things happen, like a tree falling and landing on your house. Also handy if you have a surprise and your kid/wife/house sitter/plumber needs inside your house and your not there.
I just wanted to point out that home automation and surveillance have quite a bit of overlap and can be useful for more than detecting unwanted intruders.