70% of hacker news readers develop software for a living, that doesn't make us in any way competent to judge that.
I would even argue that may make us less competent, because we use our day to day development routine as a reference for that, while in fact it's very highly probable that the first true AI will have nothing to do with the technologies and paradigm you use everyday. I highly doubt it will coded in Java and AngularJS.
Moreover who told you a dangerous AI needed to be based on human brain?
Even if that is true, and even if we are not able to do it today, it's quite realistic to assume that we will be able to at one point, not too far in time, in some decades.
So why not start reflecting today on the threat AI could cause? Rather than waiting for it to be embedded everywhere in our everyday life, and then asking if maybe we should start regulating it.
For a parallel look at the global warming issue, and how it's extremely difficult to make industries reduce their emissions now that they are responsible for a significant part of the GDP and are responsible for so much jobs. Same thing for ICE cars, we know they pollute, but we just can't stop using them like that.