Eph 2:3 says that we are “by nature the children of wrath”. Jeremiah 17:9 says “The heart is deceitful above all things, and desperately wicked”. Isaiah 64:4 says, “But we are all as an unclean thing, and all our righteousnesses are as filthy rags.”
These verses show the natural wickedness of man. We then ask the question, would it be just for a holy God to do good things to bad people? No, pure divine justice must punish wickedness. Thus, the question should not be, why does God allow bad things to happen. Instead, we should ask why does God allow good things to happen? And the answer is found in Jesus Christ.
In spite of our wickedness, God sent His Son to deal with sin and its consequences, and subsequently there are many common blessings that are experienced by people in general, and there are special temporal and eternal blessings experienced by those who are saved, which I hope is the case for you.