They are not as powerful as they seem. Separated, they are not as strong. Also, surrounded by goodness dull them. the hobbits are presented as the most innocent of creatures in middle earth. Thsu, that is why Frodo was able to bear the burden of the ring. Also, i'm sure that they had some fear of frodo, but, their desire to get the ring compelled them forward, and blocked anything else.
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FRODO: *all low and retarded* Oh Mr. Frodo, do you have any more food? Here eat mine, I’m so fat. How about I carry the ring for you. It’s soooo pretty, I mean heavy!
SAM: Why you little-!
FRODO: You asked for it!
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