I wouldn't blame it all on Trezor. The guy in the post proceeded to send funds to an address that he does not have the private keys for. That is the same as trying to burn his in-laws' bitcoin on purpose. He should not be messing around with any bitcoin, let alone other people's bitcoin, if he doesn't even understand the importance of having the private keys before you send bitcoin to an address.
How about some personal responsibility? Bitcoin is freedom, but one cannot have freedom without having personal responsibility.
Liberty not only means that the individual has both the opportunity and the burden of choice; it also means that he must bear the consequences…Liberty and responsibility are inseparable.
Friedrich A. von Hayek
Yes. The ultimate responsibility is on the user.
But, a good designed wallet should make sure the user sees the seed when setting up the device for the first time.
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