I find that conclusion presumptuous. Unless you can say how many bugs would have been discovered had the source been closed, then it doesn't make sense to claim the opposite.
Also, do we know that e.g. this and Heartbleed were discovered by reading the source? If they weren't then the availability of the source code is inconsequential IMO.
Also, do we know that e.g. this and Heartbleed were discovered by reading the source? If they weren't then the availability of the source code is inconsequential IMO.