They know their audience well --- both articles were one large appeal to ignorance:
First of all, nobody "abstains" from blood in modern society today. Blood fractions, especially minute amounts of albumin as an excipient or adjuvant are everywhere. Albumin is in allergy shots, it is in childhood immunizations including MMR and IPV, and all post exposure vaccines. It is impossible to avoid and the idea that you could even if you wanted to is simply ignorant.
Second, under the Law, blood was painted on the lintels and door posts of houses, it was smeared upon the earlobe, thumb and big toe of the priests, it was dribbled on the floor of the most holy, it was sprinkled upon tents, houses, people and animals, it was the "evidence" of a woman's virginity. The idea that blood's only "use" was upon the altar is simply ignorant.
Third, the idea that God forbade the "use" of blood is rendered a contradictory tautology when the term "use" is extended to cover blood's design purpose -- circulating in the arteries and veins. The Witnesses, who condemn both autologous as well as allogenic transfusion cannot wriggle out of this contradiction, try as they might. No one can place their fingertips over a bright flashlight and claim that they don't "use" at least their own blood. Anything else is simply ignorant.
Fourth, Jehovah's Witnesses can and do hold occupations that involve the "use" of blood. How exactly would a Witness MD evaluate kidney function if he or she could not order the patient's blood analyzed for BUN/Creatinine? How about a lipid panel for cardio risk? Or thyroxine ratio for thyroid function? Blood tests are the diagnostic staple in medicine today and will be for many years to come.
The fact of the matter is as long as the "use" does not involve either consumption or transfusion of blood than the occupation in question is a "matter of conscience." In other words, a Witness may work in a med-lab that tests blood, but he or she may not work in a blood bank. Witnesses that don't know this is the written policy are simply ignorant. What exactly is a Witness diabetic doing when they test the glucose level of their blood if not "using" it for testing purposes for Christ's sake?