If so, why? What is the basis or rationale for a materialist to have moral concerns and to conduct his/her behavior according to such ethical purposes?
Materialism treats the Mind as material. So Ethical concerns are not simply concerns of the "mind" but are a product and reflection of matter. On the one hand, there are those biological elements which determine ethical behaviour such as humanity's evolved ability for empathy as social animals or to simply experience pain and pleasure as an indicator for what may be "right" and "wrong" for a person's well-being. On the other, there are those elements which are environmentally conditioned and much more abstract. Our social relations are
material relationships and are governed by
material laws. "Thou Shall not steal" reflects the need to organise production based on property. So recognising the nature of these laws is a basis for materialist ethics.
The basic ideas are easy to grasp but it gets
much harder to understand when you are dealing with really abstract questions. Materialism is a revolutionary assault on thousands of years of philosophy and religion and so thinking about what are materialist ethics does mean learning to deal with those preconceptions.
p.s. Karl Kautsky's "
Ethics and the Materialist Conception of History" may be an easy read to show that materialist ethics are possible and how. It is low on details however.
Are there any self-identifying materialists here who try to avoid causing innocent creatures to suffer unnecessarily, such as is the goal of veganism? If so, why?
Not a Vegan really, but the main reason as a materialist I would not want to cause harm is the same as anyone else: it feels wrong. The difference is in how these pangs of conscience are understood. Emotions are there for a reason. We evolved them as part of our survival, so it is generally not a good idea to ignore them. Our emotions are "material"/biochemical processes that are a response to stimuli. To some extent they are conditioned (such as how we feel when listening to a piece of music). But emotions- as a basis for moral understanding- are material and can be a basis for materialist ethics. If anything I trust my emotions
more as a materialist because it is the "animal" side of my behaviour and that should take precedence over the "abstract" capacity for reasoning that is more unique to humans.
Personally, Animal rights and veganism are subjects that I have deliberately ignored. I like meat and if I really thought about it I think it would become problematic, so it is better for me to stay ignorant on this one until I am ready to make larger lifestyle changes and really think about what meaningful things I can do on the subject.