Businesses . are . different.
There's nothing preventing Mr. Baker and Ms. Florist and Mr. Candlestickmaker from expressing their political and religious views about "others" away from their businesses.
Even if that individual is wrong, he ought to have the right to follow his own conscience in all of his daily affairs.
Don't you see the giant hole that you've made in civil society when you equate the conduct of a business with "all of his (private) daily affairs"?
If you explicitly allow discrimination against gays (as much of this legislation explicitly (or nearly) does), it invites other carve-outs for other 'undesirables'. It's the same way that people who are against contraception have been acting. "Well, I'm not going to serve you because you refuse to sell your daughter into bondage/aren't circumsized/have pierced ears/live on the other side of the tracks/can't read/are a member of the wrong political party/didn't vote for my brother/etc., etc., etc."
These public accommodation laws are in place for good reasons.
How is a gay couple buying flowers or a cake hurting anyone? How is it destroying civilization any more than being a member of a church different than you?
A person hurting others isn't "following their conscience".
My $0.02. I think I'm done.
Cheers,
Scott.