Why should I believe that all spanking parents are sexually abusing their kids?

Do the same thing WITHOUT CONSENT to adults.

No, it’s not a kinky negotiation between adults that want this.

Instead, do it as punishment for some perceived wrong. Make sure the adults in question absolutely do not want this kind of behavior. Do it until they cry. Lie and say something like “this hurts me more than it does you.”

Up the humiliation by having them pull down their underwear to expose their asses. You get bonus points if you do it in public as a warning to other “misbehaving” adults.

Again, without the “spankees’” consent, repeatedly strike a part of the body highly associated with sexual sensation, arousal, and interest. Oh, and up the creep out factor by making absolutely sure the adults you’re spanking against their will are related to you.

Yeah, nothing to see here.   :-/