1) Polanski's plea includes testimony that he was fully aware she was 13.
2) individual boycotts may have negligible impacts upon the person/institution boycotted, true, but things CAN snowball. To me, this means that the less certain I am of the veracity of allegations of wrongdoing, the less likely I am to discuss those supposed wrongdoings with others. So, if I am unsure of allegations about X, but still feel strongly enough to boycott X, I don't even let people know about my boycott just in case I am wrong. But as my level of certainty rises, the more willing I am to puclicize my boycott, in order to get others to do likewise.
2) individual boycotts may have negligible impacts upon the person/institution boycotted, true, but things CAN snowball. To me, this means that the less certain I am of the veracity of allegations of wrongdoing, the less likely I am to discuss those supposed wrongdoings with others. So, if I am unsure of allegations about X, but still feel strongly enough to boycott X, I don't even let people know about my boycott just in case I am wrong. But as my level of certainty rises, the more willing I am to puclicize my boycott, in order to get others to do likewise.