Most of the key molecules of life are chiral, existing in one of two mirror-image structures; life uses only one. Receptors and enzymes using one cannot generally recognize the other. Most 'wrong-handed' chiral chemicals are like having a key cut in a mirror image where the index slot and the pins are cut on the wrong side; it won't even fit in the lock.
It could plausibly turn out there is so little ability for the different chiral forms to interact that 'mirror life' would not be a threat. It could also turn out to the extent they could interact, regular life could also detect and evolve how to counteract the novel pathogens in time.
And even if the interaction is low so they aren't highly infectious, the lack of ability to recognize the 'mirror-life' means regular life cannot attack it so mirror life grows unchecked and consumes resources needed for all life.
But there are so many unknowns, and so many unknown unknowns, and such absolutely catastrophic consequences for life on earth, that relying on ALL of those possible success modes working is stupidity beyond insanity.
This is probably the biggest example of "just because you can does not mean you should".
Most of the key molecules of life are chiral, existing in one of two mirror-image structures; life uses only one. Receptors and enzymes using one cannot generally recognize the other. Most 'wrong-handed' chiral chemicals are like having a key cut in a mirror image where the index slot and the pins are cut on the wrong side; it won't even fit in the lock.
It could plausibly turn out there is so little ability for the different chiral forms to interact that 'mirror life' would not be a threat. It could also turn out to the extent they could interact, regular life could also detect and evolve how to counteract the novel pathogens in time.
And even if the interaction is low so they aren't highly infectious, the lack of ability to recognize the 'mirror-life' means regular life cannot attack it so mirror life grows unchecked and consumes resources needed for all life.
But there are so many unknowns, and so many unknown unknowns, and such absolutely catastrophic consequences for life on earth, that relying on ALL of those possible success modes working is stupidity beyond insanity.
This is probably the biggest example of "just because you can does not mean you should".