There is no contradiction here. Both liberals and conservatives recognize that direct action that kills someone is worse than failing to take a precaution that results in a statistically increased risk to others. Speeding is less bad than drunk driving, which is less bad than intentional running someone over with a car. It’s entirely consistent for conservatives to say that the government should be able to ban you from killing a fetus, while also saying that the government shouldn’t be able to make you take a precaution to reduce a contagious disease.

The difference between liberals and conservatives turns on how they view the morality of the direct and deliberate act of killing a fetus. Conservatives think it’s closer to killing a person, while liberals think it’s closer to killing a bug. Neither position is inconsistent.