Is HDL protective? NO.

HDL being cardio protective
http://www.nytimes.com/2012/05/17/health/research/hdl-good-cholestero...
Now, a new study that makes use of powerful databases of genetic information has found that raising HDL levels may not make any difference to heart disease risk. People who inherit genes that give them naturally higher HDL levels throughout life have no less heart disease than those who inherit genes that give them slightly lower levels. If HDL were protective, those with genes causing higher levels should have had less heart disease.
http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2812%2...
Plasma HDL cholesterol and risk of myocardial infarction: a mendelian randomisation study
Interpretation
Some genetic mechanisms that raise plasma HDL cholesterol do not seem to lower risk of myocardial infarction. These data challenge the concept that raising of plasma HDL cholesterol will uniformly translate into reductions in risk of myocardial infarction.

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