Tattoos

So I have a couple(3)

A chest piece, a fourth sleeve on the inside of my left art, and a tiny little guy on my left shoulder blade. I'm due back for another one on March 1oth. I'm going to expand my sleeve to wrap around the rest of my arm and up to my collar bone. Eventually I want my sleeve to connect to the left side of my chest piece in one mural. I have two ideas that im using to expand the sleeve. All my tattoos have deep meaning to me and reflect my experiences and beliefs.

My quandary is this;
Why do certain Christians accept and even encourage my decisions while others refuse them? I understand that my body is a "temple." I get it. Yet I am using my body to further beliefs that are at least positive, and at most rooted in Christianity. I cover them when around those who I do not know out of respect. And I do not push tattoos on others.

Is it really so bad?