Ask yourself these questions, are these "Studies" accurate? Reliable? Without bias? How do they compare? What are the chances they might overlook something? Too many variable to list that we MIGHT not be aware until later.
For instance, in early 80's studies shows adding MTBE chemical as an addictive on gasoline that help clean the air and yes, it worked, but 10 years later with mandatory addition of MTBE... oh shyt, never thought spills will contamines the soil and spread around causing cancer and so on, they realized that the original studies didn't include potential spills that MIGHT lead to cancer. Damage done, trillions of dollars already lost, and so on. Who forked these trillions of dollars damages? You guessed it right!, it is all of us! This is perfect example that not every studies are that accurate as you MIGHT wish for.
Hey, the new designed gas can dispenser sipnot with anti spill function, I had it and I STILL have spills anyway! What's point of these mandatory stupid sipnot? Get my drift?
The point is, if we do something even with good intention has potential of negative consequences. Not every cases have negative consequences.