Humans do not know anything about the inner core of existence. Even the most intelligent male or female researchers at universities are just able to follow and develop the recognitions (detections / indications) and insights that they can refer to.
Probably for the next more 100- years we will be cognitively caught in this very earthly cage. And even if there will be a new alien intelligence. This alien intelligence will probably be inside its own cognitive cage as well.
So, well, yes, if an alien intelligence will destroy human life on earth it will be doing so because of its own mental limitations – at least when it has been subject to a similiar cognitive evolutionary process that we have been subject to.
Probably intelligence – how high and talented it might be – tends to be caught in its own reality. We at COGGY Intelligence can offer a broader access to the understanding of the innerevolutionary process of development.