LOL, good question buddy, but sorry to say I do have an answer for it. Once again, when a xenomorph inpregnates a human being, it will steal the genes from that host. Humans, unlike the Predators, aren't born with a gene that instinctually makes them want to track down and kill aliens which is why a xenomorph that hatches from a human does not behave in that way. Besides, Predators and Aliens have a shared evolution. Both races have evolved to try and counter the other, for example, the majority of the Predators hunt with an IR helmet vision, to counter this, the Alien hive has a temperature of 98 degrees Farenheit while the core body of the Alien is 46.6 degrees Farenheit, with all of the heat swirling around in the hive, it would definately obscure an IR vision filter and make it harder for them to detect the cold bodied aliens. Predators were born to kill Aliens, which would make an alien that resides inside of it have a better chance of integrating that gene.