I do eat a lot of meat. I'm not fully carnivore though. A large chunk of the people who eat just meat actually have very little tolerance of many plant foods -- they get autoimmune issues like asthma, joint pain, depression, etc. A major driving factor in the health improvements of carnivores is due to the removal of high-toxin plant foods (vegetable oils, lectins, sugar). You can learn more about this in the science-filled book The Carnivore Code by Dr. Paul Saladino or even this video by these previously-carnivore sisters who started eating some plants again.
I have found that eating white rice, potatoes, and raw honey alongside my meat gives me the benefits of carnivore without the unnecessary restriction or the unpleasant initial adaptation period many go through when beginning. Fruit can be fine too; coconut, berries, etc. These are considered pretty benign foods in terms of the spectrum of plant toxicity. I may add more variety later. To simplify, I'm pretty close to eating a "paleo" style diet if you've heard of that. That might be a good compromise for you; just eat real food that your ancestors (including your million year old ancestors) would have eaten.
From what I understand, the stories of people cutting animal products out of their diets and improving their health don't tell the whole picture; nobody just cuts out unprocessed beef & chicken from their diet. These stories typically involve people getting told by their doctor they need to get their shit together, and they make a BUNCH of changes INCLUDING cutting out animal products. Some of the accompanying changes include: cutting out processed animal foods (hotdogs, cheap bologna, chicken nuggets, corndogs), cutting our processed foods in general (cake/cookies/coke/junk food). To be fair, a lot of the benefits that the carnivore community is seeing can also be attributed to cutting out processed foods, and not necessarily to cutting out all plant foods.
Chris Kresser mentions some of these things when he debunks a very popular vegan documentary in this long podcast: https://www.youtube.com/watch?v=Dq4Apc2Xk7Q
When you just look at meat, the science doesn't support that it's killing us. Here's a section from a New York Times article from October 2019 that analyzed an important research study (specifically a meta-analysis, aka study analyzing all the studies):
"The evidence is too weak to justify telling individuals to eat less beef and pork, according to new research. The findings “erode public trust,” critics said. The health effects of red meat consumption are detectable only in the largest groups, researchers concluded, and advice to individuals to cut back may not be justified by available data. The health effects of red meat consumption are detectable only in the largest groups, researchers concluded, and advice to individuals to cut back may not be justified by available data.
Public health officials for years have urged Americans to limit consumption of red meat and processed meats because of concerns that these foods are linked to heart disease, cancer and other ills. But on Monday, in a remarkable turnabout, an international collaboration of researchers produced a series of analyses concluding that the advice, a bedrock of almost all dietary guidelines, is not backed by good scientific evidence. "
I would be surprised if your cardiologist knew about the recent evidence though -- most just don't have an incentive to keep up on the latest science. It's probably been a while since they went to school, and they don't get much nutrition training in the first place.