"valid argument for" is a correct and usable phrase in written English.
It can be used when referring to a well-supported or logical reasoning for a particular belief or action. Example: "Her valid argument for switching to a vegan diet convinced her skeptical parents to also make the change."
But this is not a valid argument for staying.
Protecting the system against hackers with malicious intent is not a valid argument for secrecy.
It cannot be said, therefore, that the prosecution had put together a valid argument for a conviction.
The panel accepted that he had been "co-operative and straight throughout the investigation and inquiry", but "wished to make it clear that ignorance... is not a valid argument" for a breach of the rules.
A federal magistrate judge in Chicago has ruled that protecting state secrets is not a valid argument for the government to refuse to tell American citizens whether they are on the terrorism watch list, the Terrorist Screening Database.
While there may well be a valid argument for cutting prison law spending, it should be remembered that following the 1990 Strangeways prison riots, Lord Woolf concluded in his report that there was a lack of justice in prisons.
However, the Dragons could have had very valid arguments for two forward passes in the movement.
There are valid arguments for euro entry (and arguments against, which I think win on balance).
There are valid arguments for protecting the rights of content creators, but it is now clear that applying these rules to the digital age isn't going to work – not least because those now affected by copyright rules are not just other companies but ordinary people.
"I hope the movie is very respectful to people of faith and we went out of our way to make sure that there are characters that make very valid arguments for all the good that the Church also accomplishes," Howard said.
These proposals appear to yield valid arguments for wagering for God, where Pascal's argument was invalid.
