I absolutely don't think a sentient artificial intelligence is going to wage war against the human species.
Memories fade but words hang around forever.
These days the technology can solve our problems and then some. Solutions may not only erase physical or mental deficits but leave patients better off than "able-bodied" folks. The person who has a disability today may have a superability tomorrow.
A mechanic is just an engineer in blue jeans.
Demolition is a part of construction.
Luckily, unreasonable expectations go hand in hand with naive young scientists. The more naive the better - otherwise we would never have the audacity to try and build a 22,000-mile-high space elevator or some sprawling underwater hotel.