It was about surveillance. If you don't understand that, think again. To make it easier:
> What obligation does law enforcement have to regulate content that you and I, as open-Internet believers, agree is unlawful?
Translation: what obligation does law enforcement has to police Internet with surveillance in order to catch content that we agree is unlawful? Same can be asked about ISPs.
> Shall we allow illegal content in order to err on the side of caution?"
Translation: should we oppose massive surveillance to prevent power abuse even if it will prevent catching unlawful content?
To that I answered, that current surveillance is already abusive, so the question doesn't really start.
> What obligation does law enforcement have to regulate content that you and I, as open-Internet believers, agree is unlawful?
Translation: what obligation does law enforcement has to police Internet with surveillance in order to catch content that we agree is unlawful? Same can be asked about ISPs.
> Shall we allow illegal content in order to err on the side of caution?"
Translation: should we oppose massive surveillance to prevent power abuse even if it will prevent catching unlawful content?
To that I answered, that current surveillance is already abusive, so the question doesn't really start.