That's a silly argument Tom. They have been using chemical additives in bread....well since there has been bread. You're kidding yourself if you don't think that the azodicarbonamide in banned from bread in the EU has been replaced by some other bleaching agent. Also, the use of these chemicals is often market driven. People like their bread white....not an oxidize grayish/beige color. As for the allergic reaction and asthma you're comparing apples to oranges. Being exposed to large levels of azodicarbonamide have been linked to sensitization reactions and astma but that's not the same as being exposed to ppm levels of the chemical. Before you're going to convince me I need to be concerned you need to provide me evidence of at what level of exposure to azodicarbonamide is there a risk to a senstization reaction or an asthmatic response and then we can regulate the chemical accordingly. 
I can also make the same argument with the use of sodium chloride in these food products. Table salt is mutagenic, is corrosive to skin, has well known fetotoxicity, as well as risk of toxiemia of pregnancy and can induce spontaneous abortions. Excessive exposure to table salt can also cause muscle spasticity, somnolence, can alter cellular respiration and the cardiovascular system, not to mention it's correlation with high blood pressure not to mention that continued high exposure can result in dehydration, internal organ congestion and coma. In other words it is significantly more hazardous than azodicarbonamide. Shouldn't you be consistant and call for the banning of table salt in food too, given the evidence?