The trouble with "targeted" news outlets

Apparently 3 Palestinians were killed in Rafah today. Question is - how? And by whom?

The Arab side: Aljazeera.Net - Three dead, many injured in Rafah onslaught
The Other side: Reuters.com - Three Palestinians killed in Gaza blast

When every story can be spun 2 ways and people only get their news outlets that pander to their specific beliefs, what purpose do those news outlets serve?