If you don't want to have to convert systems while you are in the US because you wish we could all just use one system then be my guest, everyone should be forced to wear size large shirts so everything fits everyone. A large fits on me great so it is obviously the best size and simpler for everyone right? am i right?

Sad to say this, but this time YOU'RE the ignorant one. Fahrenheit is not going to happen, because it came BEFORE celsius, it technically already happened. Though i agree that celsius makes more sense, there IS a reason that the US has not switched. Fahrenheit is only used for daily life, scientists use Celsius or whatever they need when they are doing experiments. Even in Science class they use more appropriate measurements, and in many sports they use the metric system, Track & Field in the US is mostly measured in meters. But Fahrenheit is the more appropriate measurement for daily life. Why? Because the scale is fit for daily life, 0°F is a very cold day, 100°F is a very hot summer day and 50°F is a warm and very nice day depending on the sun. It is simpler for daily life and that is what systems are for, to make life easier. You could say roads don't make sense, they just cost a lot of money to build and maintain and they are just to expensive so why do people or communities pay for them? it just doesn't make sense. its because they make life easier for drivers to go where they are going and reduces car crashes and makes travel faster and etc. Fahrenheit makes it easier for daily life.