The filter should stay on... In the end it's a revenue decision and not a moral one.
Without the filter Google could restrict their search engine if they feel this sight does not uphold certain "family values". As in all things Google this is not a humans judgment call but rather a log that is established based on the occurrence of certain words within a sites content.

Restricted search means fewer hits. Fewer hits means lower advertisement revenue.

Now unless we want to turn this into a private pay as you go site for Maemo elite, the filter is a good thing for the community.