If my tax payer money helped fund the research, I better get access to it. Similarly, if my tuition money helped fund it, then I better get access to it as well. Or even, if my actual time helped fund the research (e.g. I am a student involved in the research) then I better get access to it, too.

Sounds fair?

The vast majority of academic research is funded at least in part by tax payers either directly (grants, public universities or universities receiving public funds, etc) or indirectly (subsidies).

Even if research was "made possible by a grant from (private entity)", if it happened in a university, it most likely used university funds (from using rent-free space and equipment researchers can use, to staff and administration researchers rely on, etc)