My personal opinion is you should always use whatever tools you have access to in order to create your art. You owe no explanation or rationale to anyone for any reason!

I have used a variety of drum loops and find them to be a godsend! The last thing I want to do is learn to play drums. And I don't wanna invite a drummer into my home studio to lay down drum tracks when I can get what I want with drum loops!

Recently I have purchased Kontakt and a few other libraries and if I can learn to use those virtual instruments to my satisfaction I'll replace some of my live playing with them too! And be damn glad to do it!

The end product is what counts. And if you are happy with what you created then you have succeeded! Don't ever let some elitist convince you that you must hunt and skin your own goat, make drums from the hide and play those drums yourself in order to be authentic!