We still don't know what Oumuamua is made off of. I think we can agree anyone would rather be hurt by a baseball flying 10km/hour, than being hurt by a knife that travels 1km/h.
> We still don't know what Oumuamua is made off of.
The fact that it is tumbling and not coming on like a dart along it's long axis means it pretty much doesn't matter what it's made of, aside from it's total mass, it's not going to do some kind of radical penetration or anything else that unusual of it were to hit the Earth.
(Even if it was a stabilized penetrator dart of some kind, AFAIK, that doesn't really change much about surface impact unless you make radically implausible assumptions of composition, but I think it might effect the probability of it making a ground impact rather than an airburst.)
