Suicide Bombing Approval Rates And Stupid Statistics

How stupid can statistics get? I just came across an article in the Financial Times (EU Muslims: seeking jihad or democracy?) with a chart by PEW on "Muslims views on suicide bombing". The answers given were:

- often/sometimes justified
- rarely/never justified
- don't know (sic!)

For me, the only answer possibilities acceptable would be:

- justified
- never justified

The PEW possibilities given are plain stupid. What's the difference between "sometimes justified" and "rarely justified"? And why these two answers are in different clusters?

Btw, as the chart shows, about 1/4 of Spanish muslims think suicide bombings are justified, whereas only about 10% of muslims in Germany seem to embrace suicide bombings. Scary enough.