Do you think the burden of proof should be on some atheists as well(not all of course)?

I agree. I don't believe in god, but I know there's no way to be sure that some kind of god can't exist. To claim that 100% for sure no god exists at all is just umptuous to me. If you're gonna claim to KNOW for sure that god absolutely does not exist, then you gotta prove that, too, you aren't exempt from proving a positive ertion, just like theists aren't exempt from proving their ertions. Saying you know for sure that no god exists is just another extreme, an equal and opposite to knowing for sure that a god DOES exist. There's a difference in saying "I don't believe so, but I'm aware there's no way to be sure", and saying "I don't believe so, and I know for an absolute fact that I'm right."