The right to bear arms is not the whole thing. In fact if you read it it is quite self explanatory. The second amendment states "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear arms, shall not be infringed." So the right to bear arms is so we can have a well organized militia.
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Propoganda posters would allow normal people to see them in their everyday lives on the streets or anywhere else. It would show them that they were able to become heroes although they were normal civilians. (not sure, sorry!!)
Who are you allowed to write about?
What are your political views? i can write it for you if you give me which one