Try steel manning the argument - the practice of rebuilding an opposing view into its strongest, most logical form before responding to it.

There is literally concerns over mirror life being developed. The point is that if a system that has high reasoning capacity to solve logistical and mathematical problems, it may be able to come up with a mechanism you, puny-to-it-human, may not be able to predict. It may use technology not yet known to humans (one that it has designed itself), or may use already known technology, but figure out how to scale it up enough to cause earth-wide disaster for humans.