You are correct, sir.
You are not correct, sir, and the analogy is utterly flawed.
Abortion is a religious and political issue. The findings of science are neither. There is no controversy in science about any of the elements of evolution that trouble the religious. There is no controversy about the age of the earth. There is no controversy about common descent. There is no controversy about the general interpretation of the fossil record or the geologic column. There is no controversy about the interpretation of ERVs.
The controversies that do exist in biology have no impact on these key items.