I would argue this person has no business working with AI with this sort of myopic thinking.
If you think "fake news" is a problem now, just wait until decentralized AI networks are able to tweet, publish articles and affect public discourse in a way that is indistinguishable from human influence. This AI could be trained such that it pushes targeted propaganda and is able to destroy the lives of dissidents using a variety of tactics (generation of fake audio and video material that is indistinguishable from real life targets for the purpose of slander [1][2] as well as other techniques like DDOS, hacking, etc).
Now imagine a world in which all devices are connected in an "Internet of Things" and AI becomes sophisticated enough to exploit these networks and turn them against humans. This has wide ranging implications from surveillance to killing people by hijacking the computer systems in cars to even taking control of military weapon systems that can be used to control and oppress humans.
Now take all of that functionality and embed it within an actual robot that can move around in the real world and is physically stronger than humans [3].
There is nothing that can be done about this because non-proliferation treaties are impossible to enforce due to the nature of software. AI is going to lead to the extinction of all human life on this planet and this is coming from someone who generally disregards conspiracy theories as paranoid fear mongering. We have every reason to be afraid.
[1] https://arstechnica.com/information-technology/2016/11/adobe...
[2] https://www.theverge.com/2017/7/12/15957844/ai-fake-video-au...