5. Lava Does Not Destroy Everything
Lava is extremely hot, but it is not magic. Some waste materials, like certain metals or chemicals, might not fully break down. These leftovers could remain in the volcano and later erupt, spreading pollution across the surrounding landscape.
In the worst cases, toxic materials could be blasted out or leak into nearby areas, causing long term environmental damage. Dumping nuclear waste or other hazardous materials would be especially dangerous.