In many cultures, you only shake hands with your right hand (the left being reserved for "dirty" jobs (see bullet point #4 here)).
How about that poor minority group, the lefties: forever being thwarted by the placement of handles and utensils?
I'd rather be your "right hand man" than "out in left field"!
It turns out that life on Earth is left-handed! So maybe all this bias against leftness is just our attempt to make up for the gross imbalance at the molecular level. No one knows for sure the reason life chose left-handed DNA over right-handed, but then again - no one knows why the universe chose matter over antimatter. No only is life not fair and balanced, but the universe itself is not. I should forgive these cultural biases, all left already!
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