When you make a cold wallet, by writing 12 words in a paper with your own hands, i have mentioned many times that you should make a copy (again with your own hands, no electricity) so that you have two papers with the same 12 words you store securely at two physically
separate locations.
Please stop the talk about private key because while the seed words internally recreate it, you are not directly handling a private key, nor should you ever do it due to the security implications. Never handle private keys directly, stick to the 12 words, and protect them well.
As for the Beirut case, sadly it is yet another case of State bureaucracy. Apparently these hazardous materials have been stored for many years and across at least 4 administrations. Of course, some official designated that specific area for all flammable materials, so it was all conveniently places together (fireworks, nitrate ammonia, etc). All it took was one lousy wielding or spark igniting some fume or who knows.
You'd be surprised at how common this is in many countries: State bureaucracy plus less than stellar practices. You people in the "first" world wouldn't even know how often we gamble our lives everyday just by getting born in the wrong place. I'm sure most people in Lebanon didn't even know such dangerous things were concentrated there.
So it happens they had this port for everything related to agriculture, all that grain stored, and no doubt this nitrate was meant for fertilizing purposes. Ironically this country has had plenty to worry about with its neighbor having the largest military power of the region plus insurgency stirring things all the time.
On the afternoon of 4 August 2020, two explosions occurred at the port of the city of Beirut, the capital of Lebanon. The extremely powerful second blast resulted in at least 158 deaths, 6,000 injuries, US$10–15 billion in property damage and an estimated 300,000 people made homeless.[1] The blast has been linked to about 2,750 tonnes (3,030 short tons; 2,710 long tons) of ammonium nitrate – equivalent to around 1.2 kt – that had been confiscated by the Lebanese government from the abandoned ship MV Rhosus and stored in the port without proper safety measures for six years.