Again, with the cake

I wrote this a few months ago, wondering why cake is what seems to be the thing that gets people all worked up about same sex marriage.
Recently. we went through the deal with the pizzeria in Indiana, the one who thinks they may be put in a position of being asked to cater a gay wedding reception with their pizza, which isn't even a thing that would ever happen!

Maybe they've confused "gay wedding reception" with "gay Little League banquet"?

Then today, I saw this story out of Orlando, where the proprietors of a bakery are receiving death threats because they refused to make a cake with an anti-gay message on it that some minor league. online, agent provocateur (that's French for "shit stirrer") pretended to order.

Again, why is so much of the really heated basically all of the debate around same sex marriage about baked goods? You don't hear about churches or banquet halls refusing service or being boycotted or threatened one way or the other. Same with formal wear rental and honeymoon destinations. For that matter, nobody really seems to even have a problem with where these newlywed couples are going to live after the wedding.
But bring cake (or pizza) into it and everybody flips the hell out.
Seriously, can somebody explain this to me? I'm about as passionate about cake (and pizza) as I can be, and I literally can't imagine any circumstances involving fresh-from-the-oven tasty treats that would inspire me to make death threats, or do something stupid that inspires others to make death threats, nor be a part of a crowd-sourcing effort that raises nearly a million dollars for the purveyor of said tasty treats.
I think we all need to sit down over donuts or cookies and have a really frank discussion about what it really is that's got us all so worked up.
I'm betting we discover it's the donuts and cookies.