Step one: Don't use macOS
Unlike widely used and security-critical open source projects, right? Like, say, OpenSSL?
("All hardware sucks. All software sucks." This is at least as true these days as it was back on alt.sysadmin.recovery in the '90s)
Care to show your data and analysis?
It can be (and arguably is) true that "proprietary software is inherently insecure" - without requiring an opposite statement like "open source software is inherently secure" to also hold. (The wording in context _does_ strongly suggest that was the implied premise of the implied premise tho.)
You also seem to discount the possibility of _intentional_ vulnerabilities (from the user's perspective) being included in the software by its developer.
Similarly, the security community has discussed the possibility of intentional vulnerabilities in opensource software for decades. Sure, someone would probably notice if you submitted secret-nsa-exploit.patch but it's unclear that someone would notice if e.g. you submitted a Heartbleed-style bug, not to mention something the NSA's dual curve backdoor.
To be clear, I've been working with open-source software since the mid-90s. I think the model has a lot to offer but it's not magic. Lazy fanboy activism doesn't do anything but lower your credibility and help the companies which are arguing that open-source isn't safe to use (or isn't safe to use without paying them to manage it).