To own firearms is to affirm that freedom and liberty are not gifts from the state. You also state that the government's goal is to draw power into itself. You can reverse these statements, and they will be equally accurate in both instances. Corporations are based around the principle of drawing power into themselves. It is fact, it is, as you say, the nature of the beast.
Governments work to draw power into themselves, just as corporations do.
However, in a democracy, this is achieved by the fulfillment of the wants of the majority of the voting public. You live in such a democracy. I hope you have noticed. In such a governmental system, you have substantially more effect on the actions and goals of government, indeed on even the personell employed within the government, then you do on corporate goals and methods. You can introduce bills through your elected representatives, introduce petitions directly to the House, etc.