Bitcoin is based on cryptography which ensures digital data security. Thus people interested in it usually know more about technology than the average citizen. Those who have more knowledge about technology often notice more of it's flaws and possible exploits.
Aside from that, cryptography, being a security measure in a way, attracts more paranoic, sometimes even the so called delusional "conspiracy theorists" (although let's not forget that it attracts normal people too). Add the paranoic crowd + the tech (and other) flaws and you get the topics mostly discussed in your mentioned sections.
That doesn't explain dank.