Defunding is another word for delegating tasks. Your meme is apt because it represents someone making a big deal out of nothing in this context.
If the police cannot be reformed, leave them as specialty units tasked with criminal security and leave the mental health cases to qualified experts who can handle such situations without resorting to excessive force as Police are known to do.
13-yo with Autism, shot by police when mother called for help.
https://www.npr.org/2020/09/09/910975499/autistic-13-year-old-boy-shot-by-salt-lake-city-police
23-yo with Autism, died of a panic attack due to police immediate excessive force.
https://seattlemedium.com/autism-awareness-month-remembering-elijah-mcclain/
11-yo tackled by police and heavily restrained for taking too much milk. Investigation found no protocol was followed, police officer resigned after video went viral.
https://www.foxnews.com/us/new-mexico-police-officer-resigns-excessive-force-child
So we don't want to fund the police for dealing with these issues. To actually re-train our police to be more capable of handling these issues would be far more expensive and time consuming than just hiring new people who are specialized in this issue.
See the difference?