Monitoring the last series: ok, while I agree that Spike's popularity might not have been instantaneous, I think some viewers saw potential in his character from the start. I might even have resonated with his attitude or the dynamic he brought to the show.
As for the comments about this episode being pivotal, I think that's more about personal interpretation. I mean what might seem insignificant now could potentially have a larger impact as the series progresses. And about Jenny's behavior, I think her actions could be seen as her trying to maintain a sense of normalcy amidst the chaos. Sure, there are legal responsibilities, but people often don't act rationally in high-stress situations...