Show me a presidential candidate who hasn't been caught in awkward looking photos with kids. Sure, he's a bit hands on and in this day and age, it's a bit awkward and cringeworthy, but it's certainly not evidence of pedophilia.
Pedophiles tend to avoid signposting their tendencies in front of large crowds, the children's parents and hordes of press photographers. Having said that, I don't think I have seen the photo you mentioned about the alleged breast touch. If the parents were present and there were lots of press and photographers around, I would think it was more than likely just an awkward accident though.
Personally, I think the world has kinda outgrown the whole era of politicians kissing and putting hands on children....even if intentions are completely innocent. Some kids are clearly uncomfortable with it and it's probably time politicians stopped doing it. It's not worth making kids awkward and uncomfortable just to appear more paternal / maternal/ grandfatherly etc. Just a handshake and some friendly conversation should be sufficient. But Biden is far from the only one who does it and calling someone a pedo is a huge accusation to level at someone without clear evidence, dude. Although I can't blame you at all for saying you would be pissed if Biden or any other politician interacted with one of your children in that way.