I'm going to talk about a specific event to try to highlight my point if you don't mind.

In 1998, (ex-)Dr Andrew J Wakefield published an article in the lancet that used sketchy methodology to push the idea that the MMR vaccine was the primary cause of autism.

Peer review would eventually lead to the lancet retracting the study and evidence of his tampering with collected data and other unscientific processes lead to him resigning from the hospital he worked at in 2001 and losing his medical license in 2010.

Despite all this, British media platformed him as an alternative voice that had been silenced by big pharma.

During this coverage, MMR vaccination rates in the UK dropped from ~92% to ~73% between 1998 and 2008 and only returned to pre-coverage rates (in England, Scotland and Wales recovered a lot quicker but notably had less coverage of Wakefield's study prior to its retraction) in 2021. In some London boroughs it dropped as low as ~50% and is recovering at a much slower rate.

For reference WHO targets for MMR inoculation is a vaccination rate of ~95%.

British media essentially took an entire decade off progress to eliminate Measles, Mumps, and Rubella.