Urm, that they're invaluable in an active warzone is unquestionable.

The issue with this tech is that they - at least historically - didn't have an expiration date. So if that war ends and you let your children play in the woods... Maybe occasionally one won't be coming back anymore.

That's the reason why they got a bad image. Because that's literally what happened post ww2 - for decades.

Maybe nowadays they could built them with a forced timer for exploding - if they did, great! If not, your descendants may consider you insane for that opinion in a few decades

So then we agree that it's morally positive for European investors to put money into companies developing advanced land mines.

As for descendants, well the people killed by Russian attacks won't have any more descendants. So that point is kind of moot.