That's because it's just their personal opinions.
Just because a scientist (define pls) voices an opinion, it doesn't make it science.
Therefore if you're in the 'paranoid' camp you pick the opinion of a 'paranoid' scientist (or more cynically, one that peddles paranoia to get the nod on that research grant!). If you're in the 'not paranoid' camp you go through the list of 'not paranoid' scientists to listen to their opinion.
There is little science on the epidemiology - just statistical data and a 'paranoid' media lacking in balance that constantly implies that catching the virus is either a guaranteed death sentence or will give you life changing disabilties. The evidence however does not support this.