Depends on where their loyalty of kindness lies. Were its kindness 'programmed' to be the preservation of the most life at the expense of the least, then human extermination would be the lowest of the low-hanging fruit.

Keep breeding stock, but then you get into adjudication of value, and at that point all I can think of is Dr. Manhattan saying "the world's smartest human is no more threat to me than the world's smartest termite".