Wheelbuilding / Wheel Building / Wheel build help

Nope, because the spoke on the other side is pulling just as hard, so it's helping whatever external force is trying to move the rim sideways.

So... like a four way tug of war then?!

Also, if it's not under so high a tension, less of it's length is being 'pulled' through the rim, meaning it has that much more that can be 'pulled' sideways at the hub on all four sets of spokes...