Every event, no matter how small, causes an exponentially increasing number of consequences, spreading to countless causal chains in future history to the end of time. The result it that we are in no position at all to judge what God should, and should not, allow.
Science is now in a position to analyze effects to see if they test positive for requiring intelligence to produce. Applying that scientific method to biological life reveals that the fingerprints of intelligence are all over the genomes of life.
Since we judge other people according to our own sense of justice, when we disagree with another person’s sense of justice, they will appear unjust to us. If our sense of justice is not perfect, we are likely to disagree with some aspects of perfect justice. Therefore, a perfectly just God will seem unjust to us.
Just as it makes no sense to talk about a high crime rate if there are no laws to break, in the same way we cannot take evil and injustice seriously unless there is some ultimate standard of beauty and goodness that is being violated.