In addition to the individual protection that the @gmaxwell talked about, running the node gives strength to the correct Bitcoin chain.

Because the main chain will always be the one with the most nodes to be executed. Because this is the one that miners want to follow in order to be able to maintain the current gains.

In the end, Bitcoin Core will always be considered the promoter of the correct Bitcoin node.

Past attempts have shown that.
Can anything change in the future? Yes, but I have some doubts.