You can't look at things with a "one-sided" attitude. Everything has many aspects. You can't say that the whole world is not good just because you meet a bad person. You can't think that all water is bad just because there are reports of water quality problems. Do not drink water. Everyone knows that the collectibles on the street can't be real, and some people are fooled because they want to be cheap. If it is genuine, is it so cheap? Can I not sign a sales contract? Therefore, cheapness is a must. You still have to go to reputable shops and companies to buy expensive things. You must have as many certificates and contracts as possible, and you must learn to protect your property.