Being vegan is acknowledging and honouring living beings in a way that is practical and possible. We can control our actions to a certain extent and make a choice to support animal suffering directly or abstain. We will never fully escape animal suffering in our lives, but we can certainly minimize it by choosing a compassionate life.
The ideal is making a genuine effort to be conscientiousness of our choices. This extends far beyond veganism to considering other humans, insects, trees and even objects as we are choosing to act in a way that acknowledges consciousness and the value of being-ness.
While we may not be able to stop animal or human suffering entirely, we can go a long way to not support it through our actions. Just because we cannot stop something personally, does not mean we cannot be an individual in a collective seeking change. For this reason, I remain vegan.