That is simply not true. Technically maybe but you have to consider the human factor. There are many low information buyers. The news is poorly educated about the subject.

When the dev of a project on a sidechain rugs, bitcoin will get blamed. If the miners steal the sidechain funds, bitcoin proper will get blamed.

This is a big part of the divide. Many only see bitcoin as a NGU technology. They see drivechains as a short term way to push the number even higher. For others bitcoin has moral value, keeping value in the pockets of those who worked for it instead of those who have access to print money. For them bitcoin adoption getting hurt unnecessarily is a very bad thing, not just a price action to bet on.