Now, you're starting to make more sense!

I would definitely agree that Leftism is usually more progressive than Rightism! It certainly is, in countries like America, where the genuine leftists are also very advanced when it comes to social issues. However, because leftism is not defined by being open-minded, correct, or even forward-thinking, and merely tends to align with those far more often than not, it can be confusing to completely combine the terminology when they ought not to.

It's like using "red" as a synonym for fascism, when red is also the color of Anarcho-Communism, just because the Nazis used red on their flag. It's better to use the proper terms.