The problem of evil is the bane of theologians. Atheists hardly need to bother with this problem because atheists know that there is evil but we also knpw that there is no problematic God who allows evil to happen. Atheists know that we are on our own and evil is ours to deal with on our own, because as sure as air is breathed we have always had to deal with evil on our own with no help from Providence during the entire human past.
As precise and succinct as can be and worth all the other long winded posts. Remove God from the equation and evil defaults to one source and in the process becomes thoroughly unproblematic except in our own and often involuntary creation of it.