Should Public Libraries Allow Porn?

I just signed the following petition addressed to: Boston Public Library.

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Block Pornography Access on computers open to public

Because the computers are in an open area
I would prefer NOT to see Pornography on a computer screen when I walk into the Library, like I did recently
Children can also see the pornography if they are passing in that area
Don't think that public libraries should allow people to use their computers to access porn
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Sincerely,