>it should also be my right to work more without the governement always taxing me extra //

I don't agree. Partly the government has to be concerned with the entire workforce. Some people doing more work means that other people may not be employed, or may be under-employed. Preventing overtime, or at least providing financial pressure against it, means that those who don't want to work all hours can avoid it more easily and also helps to make sure companies employ enough workers rather than simply squeezing dry fewer than they really need.