The same is true for bacteria, moss, algae, and plants, not to mention viruses and tumors. We do not pause to use antibiotics and hand sanitizer, to put chemicals on trees or in a pool to kill moss and algae. We try extra hard to find ways to kill viruses and cancers. These are all at the level of life you are describing.
I think, this is why personhood is necessary.
You are correct, all those things are alive. But those things don't have the same right to life as human beings do. It's not morally wrong to kill those things as it is to kill a human being.
Personhood is the worst way to determine if it's okay to kill another human being. We called blacks from Africa non-persons and we enslaved and killed them. The Jews were considered non-persons and six million of them were killed. And now some consider the unborn to be non-persons and we kill millions of them each year. We should never use personhood to determine if it's okay to kill another human being.
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