That's "old America" thinking. The SCOTUS has ruled that you can be forced to purchase anything the government tells you to purchase.
If you can't be free, be in charge.
The Constitution of the United StatesArticle. I.
Section. 8.
The Congress shall have Power ...
To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;
To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress;
The Federal government has the Constitutional authority to require citizens to be members of the Militia and how they will be organized and disciplined. That includes requiring them to purchase and keep their own arms which is exactly how it used to be.