So it is. Invention isn't just a matter of a cartoon light-bulb appearing over someone's head. People work and invest money to develop new ideas, and it is always a gamble in which they might throw all that away, but deserve to gain a lot if manufacture earns a lot.
The function of a patent system isn't just to protect knowhow, but to give manufacturers an easy (now internet-searchable) way of learning about it. If patent law doesn't give adequate protection, it is setting some of the most valuable among us up for parasitism.