crazyman, your dad sounds like an impressive guy, and I don't in any way desire to demean him or you, but creatine has been studied at great length for the last 70 years, and there has never been a peer-reviewed study showing the negative effects you cite (or much of any negative effects--except for hypothesized ones in those with renal deficiencies). I'm not a trained expert, but I have spent maybe 40-50 hours reading about creatine, including several books and reading the originals of the major studies. Your father would doubtless know more about the modalities of medicines and supplements, but any intelligent layman can read the research and look at the conclusions. That is the primary source--the real science.
Believe me, as popular as creatine is, if it really caused hepatic cancer, it would be well known. Tens of millions of people have taken it, and it has frequently been written about in the popular press, which loves nothing more than to present alarmist views. Those views just can't be found in the scientific community.
I apologize if I caused offense, but it appears to me that you are the real "flamer," having twice asserted that specific supplements can cause life-threatening illnesses without, IMO, reasonable bases for those assertions. If I challenge you to back that up, that is not a flame.
Btw, I agree with being cautious about supplements, so we agree on the majority of issues here. I just think you went overboard in the specifics.