It doesn't cross their mind because they don't know and don't understand. Once it impacts them, will they know and once they research, will they understand. Do you want to wait around until the public understands? What do you think the world will look like if we just wait?

Imagine we applied your "disregard until it becomes a bigger issue" approach and ridiculed every warning as a "your group problem is not a problem". Look around you. How is that working out?

Climate change for one: "eh... scientists are worrying about things that aren't even a problem yet, we'll tackle it when it becomes a problem, if ever".

Great strategy