Oh, I agree that he had cause for concern. It's Oscorp, after all, and he doesn't know how much Harry knows about them. I just think he decided way too quickly to not even give him a chance.
I'm sure it could if the plot demanded it, but just going by what we were given, I felt it was implied that Peter's dad knew the venom works, but that he implemented this "biological password" of sorts to make it only work when and for whom he wanted it to.
That's what confused me. Why not the Bugle? Or a real newspaper like The New York Times? Somebody's blog, at least, instead of a secret lab only they knew about?
I like my Rhino well done even if I take my steak medium well.