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to your probable point, it's a disservice that marketing of vaccine boosters has clearly made vaccines seem tied to corporate profiteering, but there DO exist useful vaccines.
Oftentimes you find that a bad outcome to an illness, especially when rare, is associated with an extenuating circumstance. Covid, for example, isn't all that dangerous to young people with healthy BMIs. OTOH it is very dangerous to the elderly with multiple comorbidities, i.e. people who are in danger under any condition and need careful care.
Medicines and vaccines can be wonderful and life saving, but speaking as someone who has professionally reviewed trial data, they needed to be treated with great care.
The potential for unintended consequences is always high with powerful new medications. Techno philia and corporate greed can often get in the way of good science.