While I respect your opinion I can’t agree that your post is a solution of OP’s question in any way. It just explains your point of view on the nature of Secure Boot and solves no problem and rather tries to persuade everyone there’s no problem at all. Still, you’re sure free to think this way, no objections, let’s just get to the point where we actually suggest a solution right.
In short, @JohnnyKarate should probably just disable SB in UEFI settings and that’s it. Since he only uses Manjaro. And intends to use Linux only. And never ever ever would download and use a cool “Rescue boot CD” from some questionable / hijacked source. And would never ever boot from random USB sticks put in his PC. If so, he’d probably better to disable SB for good.
Another option would be enrolling MOK or signing Manjaro’s bootloader with own key like described here. I also happen to have my own write-up on how to achieve “Verified Boot” on Manjaro using god damned Secure Boot and TPM – these diabolic pieces of M$ crap every “true” (c) Linux user should curse and ditch (and write about it proudly), of course.