I used to be puzzled when people said this, but now I see how they panic about it, I understand
But this only serves to highlight why we need to talk about it more. Anxiety about death is a side effect of our lack of exposure to it and our unwillingness to talk about it as a society.
I get that it makes people worried but that doesn't give a good enough reason to avoid talking about the inevitable.
The lack of talk of death means that it stops rational conversations about death, how to prevent death and how to have more dignified deaths. Its what's driving the emotional response in the void of an a sense of rational conversation about death.
Anxiety is an emotional response. You combat that by encouraging rational debate. It's what helps you to cope with anxiety.