Why is it so dangerous?

There are a number of reasons why virtue signaling is dangerous, not least because it encourages a climate of reduced empathy and understanding of others, the motives behind acts become warped, and it creates a world in which the bare minimum becomes the accepted standard.

Doing a good deed to help another should come from a place of empathy and compassion. But, when it is done to serve a selfish desire for public praise, this understanding for others is shallow at best.