subwayrider
INTP wannabe
I agree with Absurdity in that I don't think my dietary choices will change an already established system. However, I also don't want to add to that established system. I don't abstain from the system in order to change the system. I abstain because ethically I don't want to be a part of the system. It's a hairline distinction but an important one to me ethically.
Systems can and do change over time. Western society has certainly undergone some very gargantuan leaps in the last several hundred years. Maybe it begins with just a few people, but these people have the ability to influence other people, who in turn can influence even more people, eventually accelerating into a very exponential, wildfire process.
For instance, most Americans as recently as the 60s were against legalizing marijuana, and now, as I recall, just over 50% of Americans are in favor of legalization for recreational use. Just ten years ago the proportion was significantly lower.
Let's see, interracial marriage, homosexual marriage, women's suffrage, women's rights have all become very acceptable, even upheld.
Slavery, racism, arranged marriage, child labor -- these are very socially unacceptable today, whereas one to two hundred years ago they were very normal.
There are many examples of shifts in societal attitudes over the years. It's important to remember, however, that they generally take time.
The lamentable fact is that public opinion is very fickle and based not at all on reason. It's sad, but human beings are incurably pack animals. If it suddenly became taboo to partake in animal products, most people would not do it. The trick is to get enough people involved in your cause, and then it does have some power.
It's like Max Planck's quote:
"Science advances one funeral at a time."
Older generations are typically the ones set in their ways, but new ways of thinking are ushered in with new generations. It comes down to the flow of time.