The problem with tattoos is that they are a choice, unlike your sex/colour/race etc so it’s unlikely there is ever going to be some sort of law that protects people who have had them from “discrimination”. So I would say that, as its a choice much in the same way as what you chose to wear for the interview, it’s perfectly acceptable to form an opinion on whether you think that person is suitable for the job. So when you decide to have one done you have to accept that it’s going to change things for you. Most people as adults recognise this and get them so they are hidden when in normal work attire. The problem arises when you change your lifestyle and the tattoo which was ok before becomes a potential issues.
However, As we all know, tattoos can be very very different. A well done artistic tattoo from a professional says different things than crappy self done or poor quality ones.
I used to have a proper punk hair do – big spikes, shaved sides, bright blue colour. Loved it even though it took me a while in the morning to sort out! My current work has no problem with me doing it again if I wanted but I realised that the initial reaction I would get when I would go and inspect places for the regulatory role I do would make my job many times more difficult I decided not to bother. I was being selfish in the other way to the people who say “tattoos are ok, everyone should just accept them” – I can think from another persons point of view! Having more normal hair makes my job easier.
Good luck to all those people who either have a tattoo or are deciding to get one removed – maybe the people who are getting one need to have a chat with the people who have had one removed first before they make their final decision!! ;)