Isn't the usual reason for being vegan wanting to stop financing something they believe is unethical?
Honestly. For a lot it is. For a lot it's something to say about themseleves and a poor opportunity to look down on others.
In owned a restaurant for five years in that time we had 6 different vegans come in (we did a large vegetarian and vegan option menu) and end up with arguments with staff or other people who dared eat meat on the next table. Usually starting with passive aggressive and loud comments and when ignored got louder. When we stepped in it would result in a massive scene. One even threaten to smash the windows when we locked up for being a 'house of murder'
Why enter somewhere that has 'steak house' in its name of you don't want to finance people not acting in what you think is an ethical way?
We probably had many vegans who just came in and ate without issue.
People I meet through work usually start with ' I can't sit here while you eat that poor animal' (response is usually 'well sit somewhere else' ) or 'how can you eat flesh' or 'do you know what damage you are causing the planet by eating meat' while sat eating their superfoods salad that's entirely grown outside the UK and transported in.
Then it usually goes into an in depth description of something they saw in Facebook and presenting it as fact.
Usually these are the ones that don't want to discuss their impact on the planet. Because they haven't thought of that.
Some try and tell you how bad it is for your health, I have been asked 'do you know you are killing you and your children by eating meat'
I would never approach a vegan and tell them what they should or shouldn't do.
I work in the fitness industry, there is a definite 'them and us' culture depending on which eating plan to do. You have the 'must eat 5 meals a day', the iifym crowd, the no carb crowd, the IF crowd etc
All vegans do not eat ethically in my opinion. But a lot of them spend so much time being concerned with what other are eating they don't think about the impact of their food.
Of course other groups do similar. But this discussion is about vegans.