Yeah, personally I think you should change it back. I Mean, there are symbols that could be seen as bad (like the Hammer and Sickle) but then there's just an explosion. An atomic explosion wasn't even originally made for war, it was Einstein's creation/idea/thing he realized (I think it was Einstein, woops if it wasn't. Point is, I'm pretty sure it wasn't made for war and war only. It was just Splitting an atom and seeing some cool energy shit). That's like saying Pencils are offensive because Lead is in bullets.