Well, if the parents don't do it, then yes.
You are clearly using the word 'rape' and framing it between 'strange men' and 'young kids' to try and connect the actions of these activists to pedophilia or crime. These activists are not raping the kids, they are explaining how animals are forcibly bred.
I can see exactly what you are doing and it is weird.
Hiding reality from children is wrong. Making them complicit in animal exploitation without their consent is wrong.
Teach your children truths in an age appropriate way and then activists won't rock their world because they will already know the truth and whether they are ok with it.
For what it is worth, I also have no belief that these activists gave leaflets to young kids. But that is just my opinion.
As an aside, children should be aware of consent from a very young age so they are aware if they are being hurt or groomed so the concept of rape should not be alien at all. You're using the word in this concept to try and connect vegans with rape. Well fucking weird of you.