I'm sure many here are familiar with this link, and the letters. An elder in regard to the blood issue wrote them and sent them to the WTS, they take a while to read, as they are quite long, if you just scroll a little down past the scans to the transcripts, and start there. He puts forth the most eloquent and intelligently thought out argument showing that there is no scriptural reason to ban intravenous blood transfusions, see also how the WTS evade all his main points over an over again. If you read it all, you can't help but agree with all his conclusions.
PS, get a cup of tea, as it's a long article!