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Stop approaching sources?
There's your problem. It's the journalist's choice whether some random bloke looking for his brother is a 'source' or not. If my brother ever goes missing after a terrorist attack I would just be a confused, angry and upset individual with no particular insights into terrorism or any other current affairs.
And journalists aren't stupid, so anyone approaching me in such a scenario would only be interested in bottling my tears and selling them on for a profit, I would not serve the purpose as a valuable 'source' by any definition of the term.
Stop approaching sources? You're basically saying shut down the journalism industry. How would you propose reporting instead?
Do you actually think this is such a terrible problem that it justifies shutting down the fourth estate?