Because lets take a simple fact of what a human is: A community of cells that have the purpose to survive for the greater good of transferring it's genes to the next generation, Every individuel cell here is rather irreleveant to this. In our very own body we do ALL. It's capable of repairs to some degree, reproduction and powering itself with just food and other stuff.
Surely you can make a single "robot" giving it AI and exceeding its abilities in intelligence and strengths. But this robot will have issues in maintenance, and energy supply, because to truly be independend form a huge maintenance chain (specialsied production, repair and power supply focused other facilities).
Otherwise the individual will sooner or later malfunction. Therefore the AI in total would either create a collective Hive mind like behavior and being what every single human is (just not on cell bassis) - An individual consisting of many other tool-indivisuals for a common goal. Or it would have do advance into a artificial life. Where each individual even has cells as we do to power itself by an external energy source. To maintain itself and repair or even reproduce ontop of developing itself further.
I think you're mixing the issues here. A _single_ human isn't any more (or less) survivable than a _single_ AI platform. You can replace robot/AI in your second paragraph with human and still run it to the same conclusion. Or when was the last time you butchered a pig - or performed open-heart surgery? It's just that the maintenance chain for wetware looks a bit different than the one for siliconware, but it isn't less complex.
And malfunctioning/dying is part of the process of evolution.
Yes, a hive mind and/or artificial life may be one solution to the problem the AI will be facing. The downside is that this solution will push humanity out to (and past) the edge. So, would we permit AI to go into that direction? If not, how would we stop it? Complete eradication and/or extremely rigid control ("Turing Police") might be the only currently viable option. Otherwise, the principle of evolution seems to be hardwired into self-propagation-capable entities at hte most basic level.
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This is a really interesting look into some of the issues of emerging AI: http://waitbutwhy.com/2015/01/artificial-intelligence-revolution-1.html
Off to read that....