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The reason that Biblical Christians warn people that immoral sexual behavior is dangerous to society is because that immoral sexual activity is risky and dangerous.
Some sins were very harmful, dangerous and devastating to the health and livelihood of the Jewish society.
And maybe the Hebrews were weaker in their bodies and immune system and the Jews had certain dispositions for having health problems relating to immoral sexual behaviors..
or the surrounding civilizations where the Hebrews entered into as aliens and foreigners were carying germs and common virus that the Hebrews had not built up immunity for - as they were entering back into the land Of Canaan coming from Egypt after hundreds of years
We can remember the suffering of devastation with disease, sickness, plagues and death that the Native American Indians suffered having no immunity when the Europeans came to their homelands.
thus the death penalty was the only solution for saving the lives of their Hebrew society - thousands of Hebrews died just in a single day from a plague in several incidences
The Bible makes very strong demands that the Hebrews were to be very involved and careful about the tasks of making sure to be washing pans, pots and clothing and washing after having sex was a mandatory law that Moses established.
Perhaps The Jews had health problems or perhaps God wanted to prevent them from having problems down the road, - and their immune system was susceptible and sensitive to the inhabitants, crops, animals and land of Canaan, as they were moving nearly 400 miles from their home in Egypt to dwell in a different environment
Today so many cities are filled with millions of diseased people who are dying and infected and spreading their infections, while they concentrate on overweight people buying a cup of soda pop.
these communities are literally destroying themselves and also destroying the family culture.
There were basic sins and laws that were made and there were “ BLOOD CRIME Laws “ that were a health risk to all. –
The term their blood shall be upon them applies to SINS that probably demand a death penalty when they are broken.
their blood shall be upon them = Meaning the “ BLOOD CRIME “ was committed against the BLOOD pathogens ....
In The Bible, once an infected person contaminated the water supply or other people through food, feces, blood or other germ spreading methods. it is over for you and whomever You Yourself also infect,
Entire families and neighborhoods are infected to die a slow, painful, horrible suffering agonizing death.
Once You catch a virus, germ, disease, Infection or anything - You are finished. { done } Your family and all others who you come into contact with are also doomed to suffer a life of agony, suffering and horrible pain –
dying slowly from a plague or disease or virus or symptom.
God was making sure that the Jews knew about it and that the “ BLOOD CRIMES LAWS “ were very clear and people had a defense and that was putting and forcing the “ BLOOD CRIME OFFENDERS - OUT “ and away from Your children and wives - as a protection.
when there were no hospitals, medicine, cures, treatments, vaccinations and medicine and doctors. Once You catch a disease You will suffer forever and all You also infect innocent others who also will suffer a life of horrible, painful, agonizing torment even though You never even committed a sin. the only way to ensure safety was to not allow these risky behaving people near Your city.
Their Blood be upon them - Blood Crimes are real, It just seems that man has decided that with man - made intuition and personal self judgment that we can bypass the Law Of Moses and maybe with the civilizations updating in technology, science and medical advancements this can be seen as an excuse to continue in immorality.
However, as time has passed this has proven to be a complete failure for mankind overall, the updates in technology, science and medical advancements have prevented the destruction of millions living in sexual immorality but -
it has failed overall in general for many, many billions of people who have died from illnesses, diseases and symptoms that technology, science and medical advancements have never cured and prevented. by disobedience to God.