That statement is just blatantly illogical. It's like saying, "if you cook using heat, you can expect to burn yourself sometimes."

If you make a living under a strong copyright system, you should expect to be perfectly fine as long as you don't copy someone.

Sure, there can be weird exceptions, and as in any complex system, we should adjust the system over time to account for them, rather than immediately throwing out the whole system. For example, when a plane crashes, we don't rush to abolish the FAA, or to ban aviation.