Do they need to spell it out for you?
'Defund the Police' mentality in politicians means they don't try to improve police staffing -> number of police stays stagnant, even while population is increasing, crime may be increasing w/ the population -> the work doesn't magically disappear, each cop works more hours -> higher pay per-cop, especially with overtime rates
Sure, you can dislike the specific numbers here in the bay area (your OP didn't say anything specifically about that btw), but the general principle is very easy to understand