In other words, with proprietary sw, at least SOMEBODY evaluated it and placed their seal/name on it. With open source, you are relying on a hope that somebody out there somewhere does it. And in various cases, we've seen how that turned out.
... and in some cases, we've seen how using proprietary software turned out.
You're not making a substantial argument, but if someone has a track record of writing completely safe software that doesn't have to be secured through third party products, like Microsoft, I will be willing to listen.
These are the arguments people have been making for/against open source software for decades. They are old, tired, and well traveled. If we want to rehash them yet again, let's go to the Slashdot archives or Usenet and have a nostalgia party. Otherwise, let's try to focus on something actually interesting.