Of course, ALL living beings need some kind of respect ...
My personal argumentation is always this:
As long as we are acting unrespectful towards animals, ANYONE can come and just say about some humans : "They're not humans at all. They're just animals ..." Like the Nazis did. Or early colonists with america's natives, among others ...
So, from my perspective, helping animals is in the end result = helping humans, in fact.
But I guess that oinly empathic beings like me can think this way. Unempathic ones will rather happily cling to the notion that the universe as such doesn't know such a thing like "respect" - so why not wipe out a whole town ? The people in there would've died anyway ...