Howdy,
Just to set the record straight. While strictly speaking getting a tattoo is a personal choice (aka conscience matter), the article cited is quite slanted against tattoos and meant to give the clear impression without saying it directly that (true) Christians should not get a tattoo.
The quote (at the beginning of the article) that was highlighted contains a cue word specifically: "Andrew contends ...
The use of the word "contend" in Theocratese is often used to set up that the position following is an incorrect one and will be thereafter shown why it is wrong.
Also note that it is not the Bible or any scripture which says that tattoos are a personal choice, or even the Society, but rather that is what the ("misguided") youth, "Andrew," states. The rest of the article then goes on to lead the reader to the "correct" view of not getting a tattoo in regular JW fashion.
Like virtually all clothing and appearance aspects of the JW culture, these are lagging behing mainstream Society and stuck somewhere in the Knorr Era.
As already noted having a tattoo is pretty much meaningless (in terms of rebellion or a "statement") and is widely prevalent today - even among the local business class - which is the "rule of thumb" that JWs are supposed to emulate as far as formal Service appearance goes.
Personally, I have never seen a tattoo that I thought added any value to the person and I've seen far too many that just seem plain stupid or pretentious. I think the human body is beautiful enough - but not beautiful enough to go unclothed for most :-) that it doesn't need any such further adornment as a tattoo.*
I hope everyone gets a tattoo and piercings and goes crazy with all kinds of body modifications, etc. because maybe then just being clean, with no tats or piercings will become what is cool.
-Eduardo
*Tattoos for ethno-religious reasons are probably the only exception.