Tell us about yourself!
Really??!! If you don't have any intention of having emotional investments in your pets may I suggest, HIGHLY, that you refrain from having any!!
I agree with everything you've said except for "True, it is sad when they die, but they're only rats - they are easily replaced in both the cage and the heart." They are not "just" rats, they are members of the family, loved pets and are not easily replaced especially in the heart!!