The "point" from a business stand point should be to make money. Why would you release anything specifically targeting some tiny demographic of the overall consumer base unless you have exhausted all other higher potential income streams and the projected profits will be less than the cost of production?

Windows is clearly the most widely used desktop operating system and therefore should be the top priority for a desktop client.
Source: http://en.wikipedia.org/wiki/Usage_share_of_operating_systems

As far as safety goes, the end user can secure a windows OS machine just as well as anything else. The tools and information are all out there. If someone has their computer hacked or bitcoin/information stolen, it is likely the fault of the user and not the operating system.