To not put too fine of a point on it, while crime is decreasing in aggregate over time, it's also spreading into areas/communities where it historically has been lower. It's still generally true that if you avoid going into the bad parts of town or engaging in social relationships with known criminals you are unlikely to be a victim of crime generally, however upper class neighborhoods and quiet suburbs are now seeing an increase in property crime and general anti-social behaviors that are occurring due to shifts in social mores and a decrease in respect that are happening within society overall.
What I'm referring to is far more subtle than some direct link between social media and these behaviors, but even in the cases of direct links such things exist... for instance consider TikTok trends like "devious licks"[1] which had students vandalizing and stealing from schools on video, including in upper class neighborhoods and at good schools.
I am /very/ well aware of the overall trend of crime decreasing in aggregate. However, I am also aware of the shift I'm noting above, and I'm aware that some crimes are now simply under/un-reported. Property crimes are definitely on the rise /in aggregate/ in some areas of the US, and can be most directly linked to shifts in enforcement. Car-break ins and bike thefts in particular in cities like San Francisco are associated strongly to the refusal of the law enforcement in the area to actually enforce the law.
We have a large number of social ills, and aggregate decreases in mental health, happening in the West, and I see this as being in the large linked to lack of self-respect and self-esteem. People with self-respect and self-esteem don't go and hurt others and destroy things, they create and produce. Lack of self-esteem is a significant driver for depression, which seems to be on the rise, along with many other related issues.
[1]: https://en.wikipedia.org/wiki/Devious_lick