In relatively simple terms with wealth comes convenience. Here, we are so accustomed to the ease of getting meat whether it be at a fast food restaurant, at a grocery store or a steakhouse. Meat then is looked at as part of our identity and as an overflowing resource available for our use at all times. Unfortunately, this mindset is why it is so hard for people to conceptualize what it means to not eat meat. Another problem I see is with the push to go vegetarian or vegan many people want you to go all the way, right away. Realistically, if you eat meat in all 3 meals a day and cut it out of just one, that still has a huge impact and is much more feasible for the time being.
Consuming as much meat as we do has devastating effects on the environment but of course ones we don't see. It involves clear cutting lands for cattle, providing tons of corn/grain/grass for feed, and the production of hundreds of tons of methane. Most often the negative impacts of agriculture effect only those who are already vulnerable, then becoming a problem of environmental racism/justice.