Bitcoin miners vs non mining full nodes

Bitcoin miners vs non mining full nodes

From what I understand, miners secure the bitcoin network by making it very-very expensive to do a 51% attack or double spend bitcoins through the sheer amount of hash power needed to overwhelm the network.

That implies, if the hash power happens to be very low (for whatever reason), an entity could theoretically mount this attack and thus reverse transactions or double spend the coins.

So what is the role of non-mining full nodes then? Does not seems to serve any real purpose to me?

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