You might not get deported, but overstaying a visa will cause you trouble if you are ever planning on getting a new visa afterwards, be it dual-intent or just to visit. Not being able to attend an on-site meeting or conference because you took "too long" to pack up and leave after having your life uprooted from one day to the next still sucks, even if it isn't as traumatizing as being raided in the middle of the night.