Doesn't matter what Corsair's warranty says (or other company warranties say). Most countries have laws requiring a company who's product fails and damages other components to pay for what their faulty product damaged. Many also have laws about reimbursement for time and production lost as a result of failure.
And regardless of their warranty the biggest reason for me is I don't want to build myself a nice system and then have to spend weeks, very possibility a month or more, going back and forth dealing with customer services, RMA department, pickup and delivery schedules, etc. to get everything replaced, then having to rebuild everything... and all this while not having my system to use and enjoy.
It's just so much easier to buy a product that has no known issues in the first place that when I install it I know I will have no problems with it.
I had a Noctua fan start making a little noise. Contacted Noctua and they sent me a replacement and asked me when I replaced the fan to break a blade of the old one and send them a picture to prove it was not in use anymore. Simples.
I had a fin get a little loose on my Phanteks cooler. Contacted Phanteks and they sent me a replacement cooler and asked me to please box up the old one and let them know when it was ready and they would have it picked up. Simples.
I bought 4 new Corsair USB sticks and 2 were defective. First I had to file a RMA, than phone them in USA to get them to pick them up so I didn't have to pay £10 to post registered to Netherlands, wait 12 day and contact again because I had heard nothing, be told they had not received them when I had UPS notification they had, another 3 day to get one replacement in stead of two, call again and spend 15 minutes on phone convincing them I had sent two in and only received one replacement by showing them the detailed record I had of what happened when, and another 3 days to get the second one. In total and RMA form and 3 phone calls over a 3 week period. Very complicated.
Now which of those three companies would you least want to deal with?