Thanks for taking the time to write this, Michael. I have to admit that my first reaction was probably closer to what you wrote.
I found it challenging to accept Jenn's premise without an emotional reaction, but tried to engage with it as an intellectual exercise. My visceral reaction was to say that vaccines that save lives (at the cost of some minor inconvenience for the overwhelming majority of people who get vaccinated) are not equivalent at all to abortions (which enable women to have ownership over their own bodies as opposed to be forced to incubate a child that is unwanted).
Your reply is well-written and passionate, but I can see Jenn's point after trying to take a step back.