Everything that happens must come from a source. By way, of example, anything that occurs on your computer must have a source code and there are only three sources. The first source is the goodness of G-od. The second source is Ministering Angels who effectively are selfish, hence the nature of selfishness. Of course all of this is part of G-d’s plan to give man free choice. And the last is the evil which seeks to have people as we see in terrorism, nazism , in radicals, for people to be its host