Answer: It was because Arachne kept on bragging that she was the best weaver.
Explanation: Athena cursed Arachne into a spider because she kept bragging about how she can weave beautiful tapestries. So one day Athena disguised herself as an old woman and had a weaving competition. Arachne was being super rude to the old woman (aka Athena), and when so many people liked the old woman's better, Arachne was jealous and she ripped Athena's tapestry. Soon, Athena revealed herself and cursed Arachne to be a spider so she can weave webs/learn her lesson. This is where the word 'arachnid' came from.
Arachne was known throughout her village as an extraordinary weaver. She bragged throughout her village of her talent - but one day, she went too far and said she had more talent then Athena! However, Athena was the god of weaving. They commenced to challenge each other to a weaving contest - but even though Athena was the god of weaving, nobody could tell whose was better! They were of equal quality! But Arachne decided that she couldn't deal with life anymore and tried to hang herself. Athena wouldn't have it and cursed her into a spider - kinder than what she could've been, because she could still somewhat use her weaving skills as a spider.
To help keep the environment safe from the harmful chemicals contained in the bio weapons. Also, depending on what the bio weapon is, it may lead to other people, like civilians or freindlies, to get infected accidentally.
Innocent: free from guilt; free from legal fault. This should not be confused with the term “not guilty.” Not guilty is a verdict by a judge or a jury that a person accused of a crime did not commit it or that there is not enough evidence to prove beyond a reasonable doubt that the accused committed the crime.