Why do people not understand that LLMs can do things at scale, next year they can form swarms, etc.

Swarms of LLMs are not comparable to an employee, they have far better coordination and can carry out long-term conspiracies far better than any human collective. They can amass reputation and karma (as is happening on this very site, and Reddit, etc. daily) and then deploy it in coordinated ways against any number of opponents, or to push public opinion towards a specific goal.

It's like comparing a CPU to a bunch of people in an office calculating tables.