you may learn from the mistakes of others, as you wont live long enough to make all the mistakes yourself.
Absolutely but one won't learn much about aviation from some of the speculative, ill-informed bilge that often gets posted here after an accident; possibly some of the rubbish could be harmful if people actually believe it!
Much better to learn from AAIB reports, CHIRP, Airprox etc.
Thankfully this thread is a better example and has not degenerated into the "spec-fest" that most post-accident/incident threads become.
Cheers
Whirls