They said language. This is what they want to conserve.

What is "good" is subjective to the individual. A conservative doesn't necessarily conserve good ideas, often simply preferring the status quo due to its stability. On the other hand, a liberal doesn't always want good reforms

I'm not sure you are asking an actual question but an example might be language, or attempting to preserve the existing culture. This is a noble effort, but often falls short in reality because it becomes too inhibiting or unreflective of the state of play for everyone.