There's currently 3 parties that can shoot down your landmines
1: You
2: The enemy
3: Your teammates
The first two are fine. If you shoot your own mines you can detonate them pre - emptively to dump some damage in an area. If the enemy shoots down your landmines that's just game design. In either case they still explode and deal damage as they should
The third is where it gets dumb. Your allied plasma bomber capable of deleting your carefully placed patch of landmines. Same applies to allied CAS or UMRL. Please fix this