I am somewhat sceptical about any facet of history that points in only one direction:

So, unless information is contradictory, you don't believe it? Or firmly documenting something invalidates it? Too Orwellian for me...

1. If we state that "History is written by the victors" can we then believe any historian's view of the past?,

If you begin with a false premise, you conclusion is also going to be false.

2. If we seek to tell both sides of the story to get at the truth, then aren't we telling lies half the time?

No. Not if its done correctly- something the historians you denigrate are trained to do.

3. ... I tend to believe that if all historians, like economists, were laid end to end, they would still end up pointing in different directions...

This contradicts your first statement, above. Are you praising diversity of historical viewpoint, or condemning it?

Best, Greg