General Injustice:
* Injustices are like a heavy cloak, smothering hope and opportunity.
* Injustices are like a thorn in the side, causing constant irritation and pain.
* Injustices are like a shadow, looming over us and threatening to consume us.
More Intense Injustices:
* Injustices are like a raging fire, burning down everything in its path.
* Injustices are like a poison, slowly spreading and corrupting everything it touches.
* Injustices are like a storm, sweeping away everything in its wake.
Specific Injustices:
* Racial injustice is like a deep chasm, separating people based on the color of their skin.
* Economic injustice is like a broken ladder, preventing people from climbing to a better life.
* Gender injustice is like a cage, trapping people based on their gender identity.
The best simile for a particular injustice will depend on the specific context and the desired effect.