Comment by ab_goat

The key issue here is the difficult choice between:

a. Incorrectly and significantly disrupting people's lives by locking them up pre-trial when many cases up getting acquitted. This can often sink folk into much worse situations than they were before, creating an endless cycle

b. Potentially releasing some dangerous criminals back into society while they wait their trials

edit: to be clear, I think the likelihood * impact of false positives is way worse than the false negatives