Put another way, if we think of 1960's era ICBM technology as entry level autonomous warfare, it's the least effective example of this kind of technology. That alone should give a bit of pause.
That is how potent this technology is, and it should be regarded with no lighter wariness.
It is more precise, more durable, more accurate, and worst of all, requires fewer people per intervention, indicating that it can be operated with a hair trigger, leaving the capacity to react with force more prone to emotional decisions.
If it seems that ordinary guns make it easier for ordinary civilian citizens to lash out at tens of victims, this technology will expand that ability even further. But, put in the hands of unrestrained organizations and institutions, operating with the capacity and constraints of nation-state authority, no less than World War III is on the table.