According to the Second Amendment, why is the government prohibited from infringing on the right to keep and bear arms?

Because it is necessary to security of a free state.

Explanation:

The Second Amendment of the United States Constitution prohibits the government from violating the rights to keep and bear arms to the states because all the States are held liable for the security of lives and properties, and hence as a free state, it is necessary to ensure that security of its citizens are guaranteed and hence this entails keeping arms.

answer; if congress didn't act on certain requests;