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Why automatically link 'destroy' with 'bombs'? Would the production of Opium be any less destroyed if these farmers were encouraged to grow something else, cabbages/sugar etc.?
There have been efforts made to do this, with some success initially. But, as you can see from your own shopping streets, where once Grocers etc. thrived there is now a Sex Shop, a Bookmakers, a Pawn Shop and sundry Charity shops.
The amount of dedication and work involved in returning your shopping streets to their more cuddly ways is no less than what it would take to turn these farmers away from their habitual practices.
The first thing that has to happen in either case is that a demand be created. As in Afghanistan and Dover, cash is king, money is power. Heroin and Cocaine are so profitably mixed together, both in terms of Cash-Clout and Political Power, that no (actual and real) effort is made to do anything other than milk the trade, and the public's gullibility.
If things are to improve we cannot take our eye off the money trail and instead get our cheap thrills from attacking those that need to turn a penny; while ignoring those that make the billions.