Accessory 2 stock screen protectors?

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http://androidforums.com – Today I took off my stock screen protector, to find that there was a 2nd protector on also but this one is fitted better. I took off the 1st one due to dust n some small annoying air bubbles. I was thinking id have to buy anyother one to keep my screen scratchless/crackless. Should I keep the second one on or take it offf and buy another? I really see no reason to take it off if you want one on. Anybodys thought would be thankful. Also why does motorola put 2 stock protectors on in the first place comming out of the factory? (General)