Pride and comfort of their flesh is what they are looking for. Not the Soul and Spirit that will lead them to ever lasting life. The Word of God cannot be broken because that is a promise that should be fulfill. God is Holy and clean. Sin is filthy and God cannot tolerate sin.
Sin is a sin, whether big or small, it is still a sin.
In the beginning of creation Father, the Son of God created Heaven and Earth. This will cause the destruction of human mankind and the nature of the earth. God created the earth, so He doesn't want it to be totally destroyed, He poured out His Spirit in the water of earth to be a protection while He was planning to do things to construct the earth. And the only way that this debt could be paid was the shedding of blood. There must be shedding of blood to pay the sin and the shedding of blood must be pure and clean.