> Absolutely yes

That's pretty strong. Recalling our pre-AI condition, there were side-channels built into our silicon, zero-day/zero-click browser+mail+IM attacks, supply chain attacks, industrial scale ransoming, mass credential leaks, commercial exploit brokers... I can't recall a time when safety could be assumed. Before even rudimentary networks were available, floppy disks were spreading viruses.

In fact, most of that is still in play. Certainly AI has reduced the cost to compromise things, but whatever period of time you have in mind where safety was an assumption was so long ago, or applicable to such a narrow subset of our information/communication age, as to be effectively negligible.