We will distrust God if we expect him to make life fair.
The primary reason life is unfair is because we are surrounded by the adverse consequences of wrong choices made by others. Conversely, our mistakes also contribute to the unfairness in their lives.
To make life fair for everyone, God would have to routinely restrict or overrule our will, as well as the will of others. He is not going to do this, because he respects our volitional freedom.
God could also protect us from unfair suffering by taking us to heaven immediately after we are reborn spiritually. Instead, he leaves us on earth to do good works on his behalf that make life better for future generations.
Unfair suffering is native to our natural habitat. We can no more avoid it than fish can avoid water.
God has given fish the physical ability and natural resources to live comfortably underwater. Likewise, he has given us the spiritual ability and divine resources to live contentedly in this unfair world.