Depriving dissenters from the chance of accusing you by accusing them first.
A pre-emptive strike is the tactic of having mainstream media accuse opposers of exactly what institution and corporations fear they could be accused of being or doing.
Since the first impression is often the most decisive one in shaping a narrative, this tactic effectively neutralizes any counter-accusation that opposers might make against the mainstream institutions, and is therefore very effective in promoting a completely inverted narrative where the victims become offenders and the offenders are seen as saviors.
Typical examples:
Institutional behavior: Spreading unsubstantiated or even demonstrabily false claims through television, radio and newspapers, manipulating public opinion through slogans and propaganda, etc.
Mainstream media: Accusing dissenters of spreading "misinformation" and "fake news"
Institutional behavior: Rejecting scientific evidence against official stances, persecuting dissenting scientists, promoting blind faith in authority, etc.
Mainstream media: Accusing dissenters of being "against science"
Institutional behavior: Corroding democratic participation, withdrawing more and more rights and freedoms, promote top-down control of society by an unaccountable elite, etc.
Mainstream media: Accusing dissenters of being "backwards" or "opposed to progress"
Institutional behavior: Discriminating and ridiculing dissenters, describing them as either evil or crazy, treating them as a threat against civilized society, etc.
Mainstream media: Accusing dissenters of engaging in "hate speech"