It's the old instant gratification/delayed fuzzy impact.
This cigarette will feel great I'll smoke it, I might get cancer in 40 years
I need this cupcake now, I might be diabetic in 10 years
I want the app now, so I'm going to accept all those spurious data access requests that might be used to con/trick/rob/profile me later.
If it would hit you straight away, light the cigarette BOOM dead, eat the cupcake BOOM gained 40 pounds, install the app BOOM 10K gone from you bankaccount, people would understand the trade-off.
As it stands, most humans are by themselves not equipped to deal with fuzzy delayed negative feedback.