How do you feel about people who get rid of an older pet because they've gotten a newer pet?
Have you even been in either of these situations? Explain why you did what you did, if so... if you feel so inclined.
Yes, jumping on the pet bandwagon. Got something wrong with that?
(As a related aside: my cat attacks me, and only me. We're still keeping her with baby on the way. Unless she tries to attack baby. Then goodbyyyyyyye kitty.)