Partitioned postgres tables don't need update trigger??

I am working with partitioned tables. I have partitioned based on date and I
have the INSERT trigger in place, I don't have an Update or Delete Trigger
but both updates and deletes against the master table work correctly. I am
not sure how these are working without triggers.
Any insight?
So, this deletes the right number of rows : / delete from
torque.test_master where tstamp ='2012-08-03 03:00:00'; /
And this updates the right rows : / update torque.test_master set
system='zzz' where tstamp ='2012-08-03 04:00:00';/
*Here are the sample tables.*
/CREATE TABLE torque.test_master( testmstr_seq_id bigserial NOT NULL,
tstamp timestamp without time zone NOT NULL, system text NOT NULL,
CONSTRAINT pk_testmstr_id PRIMARY KEY (testmstr_seq_id))WITH ( OIDS=TRUE);
CREATE TABLE torque.test_y2012m08( CONSTRAINT pk_test_y2012m08_id PRIMARY
KEY (testmstr_seq_id),
CONSTRAINT test_y2012m08_log_tstamp_check CHECK (tstamp >= '2012-08-01
00:00:00'::timestamp without time zone AND tstamp < '2012-09-01
00:00:00'::timestamp without time zone))INHERITS (torque.test_master)WITH (
OIDS=TRUE);
CREATE OR REPLACE FUNCTION torque.test_child_insert() RETURNS trigger
AS$BODY$BEGIN
IF ( new.tstamp >= '2012-08-01' AND new.tstamp < '2012-09-01') THEN
INSERT INTO torque.test_y2012m08 VALUES (NEW.*);
ELSEIF ( new.tstamp >= '2015-05-01' AND new.ltstamp < '2015-06-01') THEN
INSERT INTO torque.test_y2015m05 VALUES (NEW.*);
ELSE
RAISE EXCEPTION 'Date out of range. Fix the test_child_insert()
function!';
END IF;
RETURN NULL;END;
$BODY$ LANGUAGE plpgsql VOLATILE COST 100; /
CREATE TRIGGER testmaster_insert_trigger BEFORE INSERT ON
torque.test_master FOR EACH ROW EXECUTE PROCEDURE
torque.test_child_insert();

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