Words describing unexpected troubles

German Protestant pastor Martin Niemoller wrote a short poem with similar meaning:

In Germany, at first they came after the producer of * * *, but I didn't speak-because I'm not a producer of * * *; Then they came after the Jews, and I didn't speak-because I'm not Jewish; Later, they came after union members, and I didn't speak-because I'm not a union member; After that, they came after Catholics, and I didn't speak-because I was a Protestant; Finally, they came to me, but no one stood up for me anymore.

In order to ensure their own safety, regardless of the interests of others, do not resist power, and will eventually be swallowed up by power.

Idioms don't seem to exist