Wherefore art thou Blister Packaging

I realize the point of blister packaging is to prevent people from opening the package and making off/tampering with the contents. But it seems to me that the emphasis on preventing opening is overblown. I mean, the potato chip industry has been producing packaging that obviously prevents tampering, or at least makes it very visible, without actually making the package impossible to open. As has (with varying degrees of success, I admit) the over-the-counter drug industry, the refrigerated milk and juice industry, and the small office supply industry. And if stuff sold in blister packaging were more successfully packaged, I would not now be bleeding onto my keyboard. </rant>