If you want to discuss general threats that's kinda cool, let's do that.

My general concern is that when AI reaches certain point, it will be abused by wrong people and cause global hysteria.

Things that limit most terrorists or criminals are usually their own body capabilities and resources. Considering current technological growth, creating a sophisticated AI will be possible from home, and that brings a lot of power to people that know what they're doing. If you program an AI with the sole purpose of killing as many people as possible, then fit it in a robot full of guns, you're looking at potentially hundreds or thousands of casualties in a matter of minutes.

I guess at that point technology will be so advanced that we can't possibly know about security which will be developed to prevent it, but it makes me wonder how different our daily lives will be.