Why are so many Christians “pro life” when their own book contradicts their belief?

I always point to various Bible verses such as 1 Samuel 15:3, Numbers 5:11- 31, or even the global flood of why god isn’t pro life yet Christians can NEVER give me a straight forward answer or just tell me “I never read the bible”.

Edit: also they use the “god commands it so it’s objectively right” Schtick