With respect to Is it safe to cut off from the inside of my helmet?
This question is a good example of SE working suboptimally. The accepted answer presently has a score of 0 with 3 up and 3 downvotes.
I suspect OP has selected this answer because it matches their original anticipated answer, where 3 answers boil down to "no don't do it" and 3 reduce to "yes its okay"
So after reading all answers, there's not a clear-cut answer.
Related but not dupes:
So should the question be flagged somehow to show there is no consensus and that the reader should read the whole body of answers, not just the accepted one.