This comment reminded me of the TV show I've been recently watching on Netflix, Pantheon. It's about a different technical breakthrough (I don't want to put any spoilers), but it's also something that completely alters society, no security is able to deal with that new technology, first thing that happens is that the technology is weaponized... etc.

Idk enough about quantum computing to even understand this... but a technology that turns, say, AES or Blowfish, suddenly trivial to crack would very likely change the world

This is how I feel about drones.

They'll be banned for public use in the next 2-3 years. I'm not advocating for the ban, just saying it'll happen.

It's easier to make a "ghost drone" than a "ghost gun." Banning will not be feasible for bad actors.

Banning anything is never about stopping theoretical "bad actors", it's about reducing the number of normal people who pick up "bad thing" and making mere ownership a suspicious enough act to compel investigation. It's about making things harder. A gun on a black market will be more expensive in a place that makes guns in general illegal. Small time Timmy will not be able to afford a gun to back up his desire to rob the local liquor store.

Systemic design is usually about how you affect the margins

In order to evolve, forbiding evolution is the wrong path. Just use and study and learn from new things and accumulate experience is the way to go.

Biological evolution occurs on the backs of millions of deaths.

and a few extinctions!

They're not. What's there to think about?

As if "thinking about it" will ever stop people from acting first.

I'm far more scared when tech-bros like Musk land on Mars and contaminate stuff we might not even be able to detect yet.

i'm not even remotely 'far more scared' about that. i think you are insufficiently scared about crypto being broken

Quantum computer becoming available / powerful does not mean all cryptography will get broken. People who have actual knowledge and expertise are already busy working on various aspects of PQC.