Polite Words

It's hard to use polite words on the good timing. Shigeru Kajiwara tells it'd become worse even though I use true polite words. There are pros & cons on using polite words. When I talk, I should select suitable words. It's sometimes casual, but the suitable words could be very good offensiveness.
He also tells there are many books how to use polite words, and these books said useing polite words  would bring great success to me. However, he warns using polite words on the unsuitable case might be far from others. He also tells there is the policy to use polite words in Japanese language by the Agency for Cultural Affairs . As far as I read the policy, the policy also worries about abusing the polite words or using same polite words to everyone anytime.