The funny part of it is that, the owner of the seedphrase does not even know that you don't need to show anyone your seedphrase which I think was the main reason why he was taking it up and down wherever he goes. Imagine him explaining it to the police man, instead just ignore him. People should be enlighten what a seedphrase is and how to keep them safe.
It's not an explanation for him at all or for anyone have similar practice with their wallet seed backups.
To remind you, all wallets actually have their warning messages on importance of keeping the wallet seed words secure, safe and private. If any wallet does not have that warning, it's not a good wallet to use and it belongs to list of worst wallets ever exists for Bitcoin users to use.
This man simply ignored that warning message and considered it as nothing, not important, useless message and he eventually ended with that terrible fault in the public.
So far, I think that each wallet has its own tutorial to maintain the security of the assets that you keep in, if there is no then I think what needs to be questioned is the person who uses it, whether he reads or not all the details listed in the use of the wallet.
Most of the cases are because they don't read, they know but don't read to the end because they are too rash in securing their bitcoin.