At its best, nationalism in some forms can help unify people from disparate backgrounds into an imagined national identity. Unfortunately, most nationalism rots into division instead. Christian nationalism in the US, Hindu nationalism in India, Nazis in Germany. These all reject members of the physical nation in favor of their crazed fantasy version.
Yes. It is normal for your body to have some level of cancer cells, but the immune system constantly keeps cancers in check. As the immune system weakens, cancers are more likely to become problematic. There’s even a group of cancer that is so much more likely to happen in AIDS patients that they’re known as AIDS-related cancers.