"immunisation with either the Pfizer or AstraZeneca vaccine reduced the chance of onward virus transmission by 40–60%" [1]

That is not marginally less and which is why people should be vaccinated. Also unvaccinated people place significant strain on the hospital system preventing elective surgery and increasing my costs as a taxpayer.

[1] https://khub.net/documents/135939561/390853656/Impact+of+vac...