I believe it's unethical to teach kids on this matter without them being able to comprehend what they are listening to...

This meme is solely based on subjection. To answer your last question, even if I were a believer, read the title again.

They won't be able to comprehend what they're being taught without their parents implementing it. Why should they wait for the "WORLD" to get to the kids first and pull them so far away from the Faith that there'll be no turning back?? As loving parents, I'm sure they feel it's their job to teach them about Spiritual before the world shows them all material. Sorry for the long reply.

Yes, loving parents would do that.
But to add to my point, it is more ethical to teach their children about their beliefs when the coming of age is at the peak rather than just taking advantage of their incipient cognition on their early years. I won't emphasize my point as much due to the fact that it'll take a lot of typing. Intuitive or not, as an Imgflip user, i'm here to share my opinions as much as every single user does and not debate them.

fair enough