Transporters work by de-assembling something (e.g. you) and re-assembling it somewhere else. What if, when you’re dis-assembled, you die, and the re-assembled version of you is essentially a copy? Then every time someone steps onto a transporter, their final thought before death is that they’ll end up beamed somewhere else. And the re-assembled version (copy) just thinks that everything went fine and continues on like nothing bad happened.
If you die, you’re dead. The clone that appears on the other end, while being identical in every way, wouldn’t be the same you that you are and wouldn’t possess the same consciousness, an identical consciousness yes, but not the same one.