Absolutely!!! I don't understand why people don't automatically put the security lock on the minute they are in the room. Better safe than sorry.
Not to mention - it keeps my little one IN the room, too. I have child door knob openers on all of our doors leaving the house because my DS4 just thinks the world is his oyster and wants to head out at the slightest provocation. DD now 8 wasn't like that at all when she was his age - each child is different, I suppose. But anyhow - I throw that bolt at the top of the door because knowing DS, he won't realize we aren't at home and would (a) get completely confused and scared as soon as he realized he didn't know where he was and (b) there are strange and scary people out there who are just as likely to snatch him as steal something out of my room if I didn't have the bolt thrown!
I guess what I'm trying to say is - if purses, computers, and cameras can be lifted - so can kids. I'm not a sensationalist, but I'm all for locking others out whether I'm there or not - and all for locking myself and my family IN when we are there!