What is the ruling on da'wah workers not denouncing bid'ah (religious innovations) on the grounds of averting fitnah (trial, discord or temptation)?

Question:
He says: Honorable Shaykh, may Allah grant you success. The questioner says: In our country, there are da'wah workers who do not denounce the bid'ah (religious innovations) committed by the mubtadi' (innovators), such as the Sufiyyah (the Sufis) and others, on the grounds that denouncing them will stir up fitnah (trial, discord or temptation). So what...

Answer:
...is the fitnah? Not denouncing them is the fitnah. How does denouncing them remove the fitnah? Denouncing them is what removes the fitnah, with Allah's permission. Yes.