It's human nature mate and the nature of the internet, whether it's professional flying or basket weaving. The vast majority of people who are out there and loving it and having a good time, don't really feel the need to get on the internet and tell everyone "wow my job is great I love it". If someone is pissed off at something, or got a particular agenda they want to flog or an axe to grind, bang it's straight onto that keyboard.