Linux

Sigh, please stop using that argument, it is an easy cop out, and you don't actually help your cause by analyzing the real issue.

The real reason why people willingly use Windows is multifaceted and can be boiled down to a few points.

1. It is the defacto standard. If you are going to use a desktop/laptop computer you will probably use Windows, especially at work.
2. Most users know Windows in some capacity, this means that companies have an easier time finding staff than if they used something else, it wouldn't be impossible but it would mean spending more time and money training the staff and causing them to be less productive for longer as they learn the system. This is slowly changing with the rise of web apps, chromebooks and Macs. But still, having IT support a fleet of Linux desktops/laptops when working in a non IT sector would be increadibly wasteful
3. Software, like it or not, Windows has a huge amount of proprietary software dominance, organizations LOVE proprietary software and dislike FOSS for one reason. Liability. This means that they get a number to call, email to contact, a person to yell at, they can deflect complaints and seem like they are a strong decisive company by taking legal action against an external party, and not have the buck stop with themselves.

I am an IT technician, this is what I have seen in the corporate world.

By talking about "brainwashing" you remove most of the actual information that could help you figure out how Linux could be better suited for the masses, and to be frank, using a word like "brainwashing" makes the Linux community seem a bit unhinged/cultish.

Focus on facts, then you can use them to change the actual issue.