If they were really purists, they would shoot Raw and then just convert them to jpegs without using any of the in-camera settings for contrast, sharpening, color tone, etc. We would quickly see how unhappy they would be with their real SOOC results

The only thing those in-camera settings do is to post-process raw files to create SOOC jpegs. But, these settings gives the photographer far less control over the final image then true post processing programs.

If these so called "purists" prefer the look of their straight out of camera jpegs and are not interested in spending any time or effort to learn and use raw editors, that's their choice and it's fine with me. But please, let's not call them "purists", a term that reeks with a sense of superiority. In my opinion, they are most often just easily satisfied or they are shooting jpeg because of certain publishing or other submission requirements.

One thing the SOOC advocates don't seem to realize is that post processing can be used to make your photo look MORE like the scene the photographer saw - increasing shadow or highlight detail, tweaking color to make it more accurate, etc.

I think that "Art vs Realism" is a false dichotomy. Some photographers think that to make photographs into art they must alter the look of the photo from the scene photographed - increasing saturation or contrast, making the photo look like a painting, etc. I like doing that kind of photography myself, but I also recognize that very realistic photography can also raise to the level of art.