This is what non-genetically modified Cauliflower looks like:
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And Broccoli...
And Cabbage...
And Kale...
And Turnips...
And Brussels sprouts...
They all came from the same plant originally (Wild mustard), but are now different lines. People have no problems buying or selling any of those as either "Organic" or "Non-GMO".
This is also what makes the "Paleo" diet so amusing. It's supposed to be a diet based on what people ate in the paleolithic era (that ended 10'000 years ago). But the top recommended vegetables for Paleo are: Cauliflower, Broccoli, Brussels Sprouts, Cabbage, Kale... which didn't exist until 7500 years later. Here are some things that existed BEFORE that: The Roman Republic, Steel, Metal locks and keys, Windmills, Light houses, Screws, Mirrors, Passports, Crossbows, Pythagoras.
It seems like we're all fine eating food that have been genetically modified. Whether it be through breeding, pruning, grafting, cropping or transplants. All of those processes swap out genomes, and even whole mitochondria across individual specimens and species. This isn't natural evolution in any way, shape or form. Those changes were selective and deliberate, driven by humans, on a non-evolutionary timeline.
But can you imagine if a company were to dare take something that looks like a dandelion today and turn it into something that looks like a cauliflower? Or sell a blueberry that is the size of a tennis ball? (Natural tomatoes are the size of blueberries). You'd have a protest in front of them a mile deep.