LACK OF ALARM WITH BREAK IN

[WI328]

How well does alarm system work on 3 series? I have 09 328 sedan. Last night, parked on minneapolis street, car broken into and interior contents stolen. No external damage. Daughter's 09 accord parked right behind, same thing. However, other daughter's 05 volvo across street, not broken into but message center read 'alarm activated, check car'.
Obviously, volvo system worked but bmw and honda did not.
How does someone get into cars so easily?
What does volvo do that bmw doesnt?

[HBWT]

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2008 335i Coupe Alpine PP SP CWP Saddle Heated Seats Comfort Access Sirius iPod PS2s(non-RF!)

[Stinger9]

activated, picking the lock or forcing the lock will disable the alarm.