Can you point to a time where this has turned out to be true by your estimation? An example of a product where there was a tremendous amount of R&D required and the only thing saving the company from being destroyed by competitors beating them to the market 2 weeks later was a strong patent portfolio?
Even in the original iPhone presentation, there's a point where Steve is like, "Oh, and you bet we patented it, lol." But was that why the iphone succeeded? Was that why it could exist in the first place? Were it not for those patents, would Apple have been crushed by competitors mimicking them?
The pro-patent arguments are always expressed as hypotheticals, whereas there are numerous specific examples of patents hurting smaller companies unable to afford the cost of defending themselves. I'd be very interested in situations where the upshot is, "Oh boy, good thing for science and art that those patents existed."