I'm presuming because no one has posted an actual picture of the swastika that perhaps they think it would be in bad taste? However if you do a search for it, IMHO there is no resemblance other than you have vertical and horizontal lines, but not in the placement that you show in your rail fence block. If you are looking for something you can see it in the clouds if you choose to. JMHO
Definitely change the block if you don't like it.