http://ak-hdl.buzzfed.com/static/2013-12/enhanced/webdr01/26/10/enhanced-buzz-24085-1388073553-16.jpg (Unsupported image host)

Besides the obvious fact that The Rock is neither insecure or weak, you should probably note that both tattoos and piercings have cultural roots, it's not just something that a bunch of punk teenagers do to look cool or fit in, in some cultures they are markings of Gods. Piercings go the same way, tons of Native American/Meso-American/ African Cultures had full body piercings.

Tattoos or Body piercings are not a sign of weakness, they can have cultural ties, can be expressions of art/creativity, or symbols held close to a persons heart. If you think any of that is a sign of weakness you are an idiot.