As usual correlation don't imply causation. My uncle was a professional national level runner, he was the healtier person that I know: he ran several kilometers every day, ate correctly, no drinking, no smoking, sleep at least 8 hours/day, etc. He died from cardiovascular problems. This not means that a correct and healty lifestyle is not going to reduce the risk, but it's not the only factor.
There is a condition called familial hypercholesterolemia. People who eat normal, balanced diets have LDLs levels in the 1000's (normal is less than 100). You can take a blood sample and watch the fat float to the top like cream in fresh milk. They often die of cardiovascular disease when young. And it's just a genetic defect.
My family on the other hand, generally normal bloodwork, normal BMI/fitness levels, and everyone dies of heart disease fairly young. At least it's one way to avoid cancer.