many people left USJ to kota kemuning because high crime, too many entry and exit with shops, schools and worship places next to homes, therefore cannot fence up.

most notorious was USJ 1,2,6 with many migrants and rental crowd.  even usj  3,12,13 14 and usj 9 are vulnerable and many foreign tenants, and cannot be fenced effectively.
last time while visiting house at usj 13, the tenant actually revealed that her next door was recently burglared.

some locations are improving with  partial guards/fencing like ,4,11,5 ,16,17,18,21,  better balance of convenience and security.

i think usj 24,25,26, PUtra heights sek 1,2,3  are much better for security and greenery and bigger plots, but opposite of ldp,

USJ 3,4 & 5 are quite ok as long as no outsiders loiter around with back lanes fenced up. The only lingering problem is not 100% residents want to pay. Many are already retired and every sen counts. I think the only properly gated place in USJ Subang Jaya is USJ Heights.