The phrase "aid their argument" is correct and usable in written English.
It can be used when discussing how certain evidence or reasoning supports someone's point of view or position in a debate or discussion.
Example: "The statistics presented in the report serve to aid their argument about the effectiveness of the new policy."
Alternatives: "support their argument" or "bolster their argument".
(After all, Madonna's film had its premiere in Berlin - although that doesn't quite aid the argument).
Lim's public release of a letter sent to the Liverpool board, as court proceedings began, could be seen to aid the argument of Hicks and Gillett.
Comfort's account of the indignities of the British internment system was largely accurate – though thanking the Cologne branch of the Hitler Youth in the novel's acknowledgments probably didn't aid his argument.
These figures aided the argument of those suggesting that the AFL's initial proposed salary of $5,000 to $10,000 for most players was woefully inadequate.
Devendra Kumar Pant, Director, Fitch Ratings: Although the headline inflation is slightly high at 7 percent, the core inflation had fallen below 5 percent, which aids the argument to lower interest rates.
At TED2012, author and self-identified introvert Susan Cain gave a passionate talk aiding the argument that today's office design must still support contemplation and individual work.
Understanding the emotional arcs of stories may be useful to aid in constructing arguments [31] and teaching common sense to artificial intelligence systems [32].
If the country would institute the proper reforms quickly and stop wasting money aiding Cuba, this argument goes, it would not need any significant help from abroad and would attract investment.
He had points to bring up that would have aided O'Reilly's argument.
Banks have argued they are too strict and will impede their ability to lend and aid economic growth, an argument that may have traction with politicians.
