It's fundamentally *less safe* to fly anywhere where there is war and the combatants are armed with something more powerful than a spear or bow and arrow. an industry-wide embargo on those areas would cause them grave economic hardship and they'd settle their differences sooner. no planes = no supplies no evacuations no reinforcements no exports.....
Unfortunately, there is a lack of solidarity in the pilot profession, so someone, somewhere will always take that extra bit of risk.