The phrase "a rational case" is correct and usable in written English.
It can be used when discussing a logical or reasonable argument or justification for a particular position or action.
Example: "In the debate about climate change, the scientist presented a rational case for immediate action to reduce carbon emissions."
Alternatives: "a logical argument" or "a reasonable justification".
A rational case can be made that this was mistaken, or even immoral.
But with the threats of climate change, violent weather, unconventional warfare and uncontrollable diseases lurking everywhere, it's hard to maintain a rational case against basic preparedness.
Small battles matter, and, in this one, I choose to believe that somewhere in the system, a rational case has been made and heard.
Robert L. Bixby, executive director of the Concord Coalition, a nonpartisan budget watchdog group, said, "There's a rational case to be made for adding a drug benefit to Medicare as a matter of health policy".
And Jon Huntsman's rep, a real estate developer named Frank Levy, made such a rational case for the former governor of Utah that I allowed myself to believe he had a chance.
It's hard for the world's leading designer, Tom Ford, to make a rational case for his new spring clothes when corporate profits are down and anti-globalization protesters are on the march here, and even harder when some of the most beautiful women on earth have to struggle to keep their fannies covered.
I cannot see any rational case for believing that.
But the stakes were high that night, and the jibes from the audience began early on, as speaker after speaker failed to articulate any rational case, but only heaped their own prejudices on the growing pile of bigotry.
Without a compelling rational case against underhand serving, I'm inclined to test my normative ethical conclusion empirically on-court.
Magic in the Moonlight is Allen's most gratifyingly airy concoction in a while, but it's also a comedy that insists, in the end, on making an overly rational case for the power of the irrational.
For instance, few would assert that there is still an extant rational case for belief in phlogiston — any explanatory work it did at the proximate level seems to have ceased, and deeper explanatory uses for it have never subsequently materialized.
