Think about it. If telepathy existed — even to a tiny degree — it would confer an enormous selective advantage in evolution. Even a tiny amount of telepathy would be far more useful than a tiny amount of camouflage, a tiny amount of a wing for gliding, a tiny amount of language. It would enable you to know, just a little bit quicker than your competitors, that there’s a delicious duck with a tasty nest of duck eggs right under that bush… or a ferocious tiger behind that other bush waiting to make you into a meal… or an enemy crouching in the tree branch over your head, waiting to conk you with a stone axe. Even a small amount of telepathy would give you enough of a survival advantage for natural selection to sit up and take notice.
And, need I say, telepathy would confer a ridiculous advantage when it comes to reproduction. If you could know whether the person you’re trying to mate with is interested or you’re just wasting your time; if you could know what their turn-ons and turn-offs were and work your angle accordingly… you’d be in like Flynn. The ability to know what the opposite sex is thinking, or even to be slightly better at guessing than your competitors, would get your DNA replicated so fast it would make your head spin.
If telepathy were plausible, if it were even possible, if even a tenth of the people who claimed to have it throughout history actually had it in even the slightest degree, we’d all have it by now. At the very least, an awful lot of us would have it. We certainly wouldn’t be debating its existence, any more than we debate the existence of eyes or hands or brains.