Also, a symbol can be ruined locally and not ruined globally. The swastika wasn't ruined for Eastern cultures, but it was definitely ruined for everyone but Nazis everywhere else. If Buddhists decided to get together to try to "reclaim" the swastika for its original peaceful intent, they would fail utterly, even though they have a perfectly rational and defensible case.
http://images.amcnetworks.com/ifccenter.com/wp-content/uploa...
It didn't work well, both because it was such an obviously forced meme and because they got so carried away that they burned a large number of sockpuppet accounts.
Tptacek's "It's hard to have too much sympathy for people who casually evoke "Kek" and then are shocked to learn people believe them to be white supremacists." made my brain spin in my skull and had me reading sewage-filled Wikipedia pages on a Saturday (of Souls, no less).
And is the letter 'x' really ruined? The swastika wasn't ruined for many Eastern cultures as its original meaning was widely known.