How are landslides both destructive and constructive?

Answer 1

Landslides can be construction in terms of their ability to reduce stress on particular areas, after the slide occurs the area is not in a relaxed state and no longer under intense pressures not forces, and the area can be regarded to be "stable", not compacted nor consolidated but in terms of energy and pressure, it's much more stable. Landslides can also be rather destructive, blocking roads, covering houses that may lie below it, killing livestock (if within flow), and displacing poles, fences or gates.

Answer 2

It's a destructive force.

Answer 3

both