MentisWave really red pilled me on this.
(Super based libertarian YouTube channel btw, if you don't already follow him you should.)
Discussion
I want to add that humans are imperfect "by default". No one can get an armor that makes them immortal or invincible or perfect. Humans can't and will never achieve perfect defense. The better you get at a specific thing, the cracks and trade-offs start to show in previously unrelated parts.
In order to defend yourself effectively, you will always need the ability to inflict damage