That's why we get all those funny little slogans and rhymes on the air waves. They all try to make up good sound bytes to sell their wares. In this context, a good idea is not necessarily the truest or the most complete. Politicians know all this stuff too. One of our main jobs in life is to pass our selfish genes on to the next generation.
Brains too pass on ideas just like life forms pass on genes.
One difference, though, is that while a brain can change ideas, a life form can't directly change its genes. Note that genetic engineering may some day let us change our own genes. Richard Dawkins coined the word meme to symbolize the way ideas and genes are alike. Thus, most ads we see on TV are memes. We can also look at things like science, math and logic as memes.