Ok my question to that is what if a virus had been found in these
files?

and what if you have 3 physical hard drives and for some reason they
all have files in that folder?
Remember that a virus in a restore point is completely innocuous, and
can't hurt you in any way, *unless* you restore from that restore
point. Also remember that you can't selectively delete restore points,
so getting rid of the infected ones, means getting rid of good ones
too. And if you have a severe enough problem, you may even want to
restore from that restore point, then remove the virus using
anti-virus software.
It would certainly be rare that you would want to purposely restore to
a restore point you know is infected. But it's possible that it might
be your only choice short of a clean reinstallation, which almost
certainly would be much more trouble. My point is that keeping the
infected restore points can give you extra useful options. But it
certainly requires the discipline to keep track of when you had the
virus, and which restore points are (or may be) infected, so that you
don't accidentally restore from one of them.