re: How did we descend into this from 20-30 years ago?

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She also founded numerous charities. One becoming renowned for its efforts to remove land mines from former war torn countries

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Not quite accurate. She also lobbied against the continued use of land mines. That's one of those feel good, brainless causes that doesn't stand up to much intellectual scrutiny. The British Army is never going to match an opponent in a major conflict in terms of manpower and equipment. Mines are an inexpensive and efficient way to increase the lethality of your forces without risking mass casualties. Was Princess Diana going to visit British mothers and console them because the Army could have reduced its own casualties through the use of mines, but in the name of some nebulous PC cause had to commit more troops to an incident or conflict?
It was one of those celebrity virtue signalling causes meant to appeal to emotions rather than common sense.