Yes, it does annoy me when that happens, but as Mary stated, you can't control the actions of others. IMO, if you discover your female is prego or locked when you don't know anything about breeding and didn't plan to breed, the best case scenario 9 out of 10 times is have the female spayed ASAP if it is not to late. You will NEVER in the short time a female carries a litter be able to prepare yourself enough to be able to 'handle it just this one time' on your own. Bringing a litter into this world is not something that should be viewed as 'cute' or 'fun' or 'a good learning experience.' It's a danger to your female...period. Even more so if you don't have the slightest idea what you are doing. I think sometimes people put what they want before what is best for their dogs and that is very unfortunate.
That being said, once it's done it's done and the best you can do is try to offer advice and support that will best benefit the female.