Other:
Not eating meat is a lifestyle choice, and it's rude to not include vegetarian options.
Those that DO eat meat don't eat JUST meat. So providing vegan choices aren't ignoring their dietary restrictions. Unless, of course, someone has a problem with soy or nuts or something.
It would have been nice if they took into account their guests that do eat meat, but it's not a necessity.
I voted "their wedding, their choice."
I don't think it rude for meat-eaters to not include vegetarian options. I would always include at least one vegetarian dish, but I don't see it as being absolutely necessary. A good host will always provide a great variety, but it is their wedding, their food bill, thus their choice.
To quote you "It would have been
nice if they took into account their guests that do eat meat, but it's not a necessity." What is good for the goose is good for the gander, so "It would have been
nice if they took into account their guests that are vegetarian, but it's not a necessity."
It would also be nice to serve a low-fat dish and a low-sodium dish for heart compromised guests, a gluten-free dish, a low-carb dish for diabetics, etc, etc, etc. But, if you start taking everybody's dietary restrictions into account, it can get crazy.
Personally, I never go to a wedding for the food. I go there to have a blast celebrating with the couple. They just as easily could have perfectly appropriate food, but ones that I just don't like.
I always eat before a wedding and there have been times we have stopped for fast food afterwards. It is the couple's day and I do not feel entitled to be catered too, especially since I am not paying for it. And no, my gift does not count for an "admittance fee." I absolutely detest veggies, but I am a big girl and would have paced myself on alcohol and had a great time despite not getting exactly what I wanted.
Most people aren't going to suffer if they go without food for a few hours. Those who would suffer usually carry something with them for emergencies. If one is really that worried about food choices that may be available, then put something appropriate in your purse.
So, while it would be nice, I don't think it rude or necessary for a bride to choose not to provide a dish for every dietary need that exists, vegan being just one of them.