God is absolute good, he is omniscient, and he is said to has a plan for all living humans. So with this said, exactly what 'terrible' things is God suppose to prevent when there is nothing terrible to prevent?
lets remember that we are mere humans, born sinners, and easily corruptible, our moral standards can not compare to God. These people who deem that 'terrible' things require 'prevention' are people who think themselves equal or better than God, and who are these self righteous people to judge God in the first place?
So when we think things are 'terrible' and requires 'prevention', just stop for a moment and think, then you'd realize that prevention is not required because there is nothing terrible happening, God is absolute good and the plans he has for each one of us is playing out exactly how it should, and we the created have should NOT question our creator. After all, we want to be with God in heaven, God loves us, and in his absolute goodness has a plan for us to reach heaven, all we have to do is accept him into our hearts so that we may be judged righteous enough to enter heaven.
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If you are a true believer, then there is nothing that's ever wrong, everything happens for a reason, and that reason is Gods plan, so technically no believer should ever question this plan.In fact they should all be ecstatic when their life ends as it brings them closer to their God and bliss in heaven...to want to prolong life in the flesh or help others prolong life in the flesh is to have doubts about their God, his plans, and the after life, in which case most believers would default to agnosticism as they play pascals wager. (I would say this is the best position believers can have if they can not drop faith altogether, because at least it allows them to cherry pick and only follow the best things in the bible making them better people)
But if your not a believer, you are a realist, after all the life we currently have is the only life we know we have, which makes life that more precious. Our strong empathy allows us to judge and deem things to be terrible and of course try to find solutions and ways to prevent such terrible things from occurring in the first place. Just because an authority does something which is bad but says it's good, like slavery, does not mean that it's good, which is why people question and judge, if deemed bad they'll fight it in one way or another until there is change, it is also why we help others in other countries when struck by natural disasters. Empathy is the greatest attribute we have for the survival of our species but also for the stability of our way of life in the communities we live in.