A relativistic impact sufficient to allow chemical analysis from space is probably sufficient to kill creatures that may live on the planet. I'm not entirely comfortable with this.
Nevertheless, your point stands, if we consider technologically advanced life a possibility. It would be real shame to clobber someone's moon colony. Perhaps, these impactor missions should not be considered on the first expedition.
Of course this is a somewhat strange micrometeorite, but it shouldn't be too far from the standard set of space debris.