We do well enough. It either happened naturally, or less likely due to a lab accident. If there is a cover up it is to hide incompetence.

Yes we do. We also (despite theories stating the contrary) know that the current climate change is caused by us burning too many fossil fuels, that the utility of vaccines preventing deadly diseases outweighs any rare side effects, that airlines are not involved in a secret conspiracy of releasing chemicals (all airlines at the same time and only in certain meteorological conditions), and that the earth is roughly spherical.