The author basically concludes in the 1st paragraph that people who take morality seriously are vegetarians. That implies that people who aren't vegetarians don't take morality seriously, doesn't it?

Sorry, no? I've noticed that people who take morality seriously are more likely to be vegetarian than the general population, but that's very much not the same thing.

My family, my friends, my coworkers, etc. all can see that I'm eating meat. This also has consequences as far as influencing the opinions & future behavior of others.

But if someone else is a vegetarian instead of you, presumably their family, friends, and coworkers will see them not eating meat, and it should roughly balance out. Unless you think you have more influence than the people you'd be paying to advertise to and convert? (Which is quite possible.)