Are you being ceral?
You are reading to much into Fieldmarshaldj's argument there.
I remember we talked about this incident before after I mentioned I wished someone would pull a Preston Brooks on some congressional rat (I forget who) and half seriously lamenting that today that would land you in prison. I don't remember the details of the discussion unfortunately.
It's true slavery wasn't the reason Brooks beat him half to death it's cause he made fun of his relative Senator Butler mocking his stroke addled speech and the like. It was then spun into an attack on anti-slavery free speech. I don't know if that's what Sumner wanted (someone to attack him so he could use it) but got more than he bargained for obviously due to the severity of the attack.
We all agree with Sumner that slavery was a great moral evil. I can't speak about his 'honor' or that or Butler since I don't know enough. I can say though if I was a politician at the time I would have worked to avoid the Civil War and end slavery through peaceful means (but still speaking against it and aiding escaped slaves) rather than deliberately fanning the flames of war (that led to hundreds of thousands of deaths as well as the first income tax and the first draft and ultimately left most former slaves not that much better off due to the failure and abandonment of reconstruction). If I understand correctly that's what DJ doesn't like about Sumner.
If I was a slave though I'm probably feel a war was a great idea if it meant my freedom.