What's in a name ? It creates the very first mental image of the "thing" being named.
Is it not wrong, then, to use such strong words in the name of a creature ?
Dolphins have razor sharp teeth, are carnivorous, and hunt fish, yet that is not the first mental image you get when you hear the name "dolphin". Therefor, the dolphins are not different at all by orcas. In fact orcas can sing better !
Stop the discrimination against these orcas with such sensationalist titles "Killer Whales" and rename them to "Sea Pandas".