I ask you again—what is the other option? How can we deal with the world other than via “mind-projection?” I claim that you do it too, you just do it in a more sophisticated way. Do you have an alternative in mind?
As always, there’s the difference between “we’re all doomed to be biased, so I might as well carry on with whatever I was already doing” and “we’re all doomed to be somewhat biased, but less biased is better than more biased, so let’s try and mitigate them as we go”.
Someone really ought to name a website along those lines.
You could attempt to perceive the universe in all the other viewpoints of every other living being while you perceive it as you would naturally.
Or, to make it extremely simple: Keep in mind that everyone else does not think in the same way that you do.