Anime And Davids Star

There's been this topic that has always questioned me..........
WHY DO THEY ALWAYS USE THE STAR OF DAVID IN ANIME?!!! I really need this question to be answered! Here are some examples:

In DNAngel vol 6 pages 110 and 111 it shows multiple images of the star of david.

And don't get me started on fullmetal alchemist!They use it all the time!

Just in case you don't know what the heck the star of david is ,it's this.

It's used in jewish churches.

So if any of u guys have any idea why they use the star of david in anime please tell me in the comment box