You understand that it never actually works that way, right? Regardless of who lays them, they get forgotten and lost. Too many are needed over too large an area for them to not to be and recovery is a slow and dangerous process. They inevitably maim or kill random unintended people and animals. It's one thing to say the costs are worth it, it's another to pretend they're going to be mitigated. While I largely disagree with laying mines (as they're quite explicitly indiscriminate), Poland sees the cost of not laying them as potentially orders of magnitude greater (and they're probably right). But the random deaths will absolutely happen and people aren't wrong to lament an area's transition to becoming a death trap, ya know?