Quote 1
LAERTES
How came he dead? I'll not be juggled with.
To hell, allegiance! Vows, to the blackest devil!
Conscience and grace, to the profoundest pit!
I dare damnation. To this point I stand,
That both the worlds I give to negligence,
Let come what comes, only I'll be revenged
Most thoroughly for my father.
(4.5.148-154)
Compared to Hamlet, Laertes is like a little vengeance roadrunner: when he learns that his father's dead, he returns from France immediately, storms the Danish castle, and promises that he'll be "revenged." But Claudius eventually convinces Laertes to pursue a more roundabout path to vengeance. The intricate plot to lure Hamlet into a "friendly" duel recalls the kind of plotting (which results in more delay) that we've seen from young Hamlet. Do Claudius and Hamlet have more in common than they'd want to admit?
Quote 2
DOCTOR
No more be done.
We should profane the service of the dead
To sing a requiem and such rest to her
As to peace-parted souls.LAERTES
Lay her i' th' earth,
And from her fair and unpolluted flesh
May violets spring! I tell thee, churlish priest,
A minist'ring angel shall my sister be
When thou liest howling.
(5.1.244-252)
Since Ophelia's death is suspect, the Priest refuses to do anything more than the bare minimum for Ophelia. But Laertes isn't having it: he thinks that the stingy burial rites aren't doing Ophelia's memory justice. He understands what the priest doesn't: burial services are rituals for the living.
Quote 3
LAERTES
I am justly killed with mine own treachery.
(5.2.337)
Well, that about sums it up: like every other deceptive character, Laertes dies because of that deception. Shmoop out.