Even firsthand experience is biased in many ways.

This doesn't meant that some sources of information aren't more trustworthy than others, or that you can't get a reasonable idea of what's going on by combining information from multiple independent sources.

For instance, I'd generally trust a statement of fact consistently reported by multiple wire services over conflicting information from official government sources, and I'd never trust any one source to tell "the whole truth", to the extent such a thing is even possible.