You should educate yourself on the drug development process and FDA regulations.
"More" data is always better, nobody disagrees. But more data costs more and takes more time to gather. So the trade off is - do we approve this medicine now, knowing what the risk are, are do we not and deny patients this medicine?
There is no "safe" drug. There is no drug where all the risks are known. Even the FDA will tell you that. It's all a risk-benefit trade off.
"More" data is always better, nobody disagrees. But more data costs more and takes more time to gather. So the trade off is - do we approve this medicine now, knowing what the risk are, are do we not and deny patients this medicine?
There is no "safe" drug. There is no drug where all the risks are known. Even the FDA will tell you that. It's all a risk-benefit trade off.