From my observation of having been on the net 7 years, there are 2 topics that you avoid like the plague ...

1. Religion;
2. Politics.

People's views and opinions  on religion and politics are stong and run deep and any discussions are likely to end up in name calling, fights and hard feelings because people haven't learned to respect other peoples'  views.  Instead of listening and accepting that someone has a different view than our own, many...ok, most...tell people their views are wrong and seek to try and convince them to change.

Those 2 topics are volatile and have a long, long history of war and blood shed and  I don't see that changing in the near or distant future.

As for pictures for avatars and sigs etc. From what I understand whatever you use has to comply with the site rules where copyright and nudity is concerned.

I don't really care who people worship as their heros. We are all adults and we all have choices and if someone chooses to admire someone that I don't, it's certainly not my place to tell them they are wrong for doing so.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi