Keep in mind that these arguments have to be made to laypersons, who don't usually have a lot of technical knowledge.
This may help explain some reasons: https://www.amnestyusa.org/reports/encryption-a-matter-of-hu...
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -- Benjamin Franklin
Without those people, I wouldn't be a free citizen today.
Massive surveillance can neutralise every possibility of fighting against oppression and defend liberty.
While I acknowledge that there are bad actors that abuse this freedom, I think it's still worth it.
https://m.youtube.com/watch?v=tabVaoeNtdk
That’s why.