Gluen is increasingly added to food for no obvious reason, yet it is a dangerous poison to many people, and in added quantities probably to many who otherwise would be tolerant. You will find it added to many foods to improve its texture with no regard to its harmful effects.

Gluten is concentrated wheat isn't it? I would say then that this means that the poisons in the wheat are what is causing the trouble. Pesticides or GMO Genetically modified Object.

No, it's not the pesticides, it's gluten itself. Some tolerate it fine, others don't and it's been certainly proven overwhelmingly to be helpful to avoid for many people. Same goes for dairy products, aka casein. Therefore the GFCF diet - which stands for Gluten-Free and Casein-Free.