Even if it's hard to conclusively prove intent, I think it's easy to see how there must have been at least recklessness in play and perhaps even wilful blindnes

Even if it's hard to conclusively prove intent, I think it's easy to see how there must have been at least recklessness in play and perhaps even wilful blindness. In other words, even if they didn't know that what they were doing was harmful, they should have.