"It should be made illegal."
¡Yikes!
Well, it's illegal to drop a toffee wrapper in the street.... but not illegal to deliberately destroy documents and papers of a socially historical nature. Seems odd when you look at it like that.
And you can get fined for some ridiculous 'offences'
Imagine if that old lady had had three sons she'd lost in WW1, there could've been a multitude of sadnesses in that family and even though it was thought "she had no family" we all know how they can randomly turn up. She might've had a sister who pre-deceased her and who'd moved abroad and whose children would start digging into the family history!
Or, there might've been the earliest photo of somebody who eventually became infamous, who'd lived next door to her for 30 years, that a researcher could discover when writing a book 50 years in the future.