There is nothing wrong with buying from a breeder!! Myself, I have to rescue GSD's, and wouldn't trade them for the world (most days)

The upside to buying from a breeder is that you can see the parents, and you know all about there health. And you can get them while there babies! Where as rescues..we got Sierra when she was 5 months and Buddy when he was 1 year old..you have no idea who there parents are, and you have NO idea what you could be getting yourself into health wise!! My first rescue gave myself and my hubby MANGE!!!
It's all up to what you want to do! A lot Rescues come with problems, both of mine didn't trust people..head shy..afraid of almost everything .... Sierra wouldn't let men pet her for almost a year! And Buddy...well..we've only had him 7 months, and he's still afraid of my hubby!! Getting better, but he still needs a LOT of work! And you have to make sure you and everyone else in the house is going to be willing to help with training, and gaining trust.
But hey, you never know, you could get a dog from a breeder and have problems!! It's all about how you bring the little pup up!

So all in all....no It's not wrong to buy from a breeder! (as long as you've checked them out...not a back yard breeder or puppy mill)
But if you have the time to spend with a rescue....then maybe look into a rescue!