SQP1,
I neither work for or have much interest in DHL as a company, but your attitude is way off base.
Fumes are a massive issue in the airline world, I know many crews who have been affected by them, some to an alarming degree. One was hospitalised for nearly 6 months and he was ex-special forces, so not exactly a wuss or moaner.
You also state that DHL has never had an engine failure, yet I know of at least a couple of inflight shutdowns that DHL have suffered in the last 10 years. Not firey uncontained failures, but problems none the less.
The other pilots in your airline are your closest colleagues and your attitude towards them is not a sensible one. If you can't rely on your fellow pilots, then that is a very sad day. Your attitude is alienating you from the general consensus, calling people fools for their fears is a very daft thing to do.
Especially when this problem is well known and documented.
The fact it is not being acted upon reflects very poorly on DHL upper echelons.