Why eveyone are saying thermasilk is good when it has silicone and Propylene Glycol?

Why eveyone are saying thermasilk is good for your hair when it has silicone and Propylene Glycol, this stuff aint good for natural hair, using silicone can cause your hair to break and build up, and using Propylene Glycol is not good to put on your skin, it can caused liver damage and kidney damaged. I dont know why everybody saying certain shampoos are good when they have bad products in it for your hair, like for example Pure Shea er Cantu shampoo also have alot silicone, Garnier fructis also have alot silicone, and many others. People this stuff is not natural, so why say it is good for natural hair when it is not?