All who have come to know Jesus as Lord have done so through the power of the Holy Spirit. Now regarding the troubles of this world. The troubles of today are directly in response to this principle and man's allegiance to serve satan, although very few would directly say they were. Aids is in direct response to sexual sin. Unfortunately, even the innocent are sometimes caught in the web of this deadly disease.
Murder can stem from many different sins.
And yes, most of the time the victims are innocent. Hunger is in response to man doing the work of satan through war, political corruption, and the fact that God just can't bless the land. America is a land of plenty because it started out as a nation under God. Even today, many still hold to His principles, though we have faltered a bit. These are only a few examples of why the world is in the shape it is in.