I don't understand how US Republicans talk about fiscal conservation, yet allow rampant profligacy. They must have a different agenda than the one they speak of.

What they always really mean is tax cuts for those who need it least

"Talk" and "Walk" aren't the same word although they rhyme. And they only refer to Democrats, who are the only ones with agency in government (Murc's Law).

When they engage in financial conservation it's cover for destroying programs they don't like. The fact that they are cheering on yet another incredibly stupid, expensive, and pointless war proves that they are not "fiscal conservatives."