Upon further inspection, the furor over the shape of the memorial to the Heroes of Flight 93 is beginning to look like a tempest in a teapot. As can be seen from this image (below) of the proposed design, the "crescent" began as a meandering, ragged semicircle. LINK to data.
And as can be seen in this image of the final design, the "crescent" is still a meandering, ragged semicircle, only less so. Notice area 4. It is the most important part, called "Sacred Ground", and it breaks the flow of the circle. Also,if a line is drawn between the middle of the two ends and the center of the circle, it does not point to Mecca. To liken this to the crescent of Islam could be construed as an insult by some Muslims. Of course, some Muslims are insulted by our existence on the planet anyway. LINK to data.
(clic on pic to enlarge)