No, it's very clear from the get go Roy's first instinct is to murder everyone in the tower and take it by force. Trusting this guy with a hair-trigger temper and nasty uncivilized notion of social Darwinism, it's pretty clear it's chancey to let him live. If I hadn't just talked to Michael, the other male ghoul, I would have slaughtered Roy right then and there because he's clearly a menace.
And yet, he has no problems in listening to you and agree with letting you talk people in Tenpenny Tower's into letting the ghouls move in peacefully. He says he doubts it will work, but he gives you the time to try it. He also rewards you if you managed to get the ghouls in peacefully and sounds surprised and pleased with the result:
I'll be damned. Really? Good job kid! I was willing to unleash the Ferals and kill all those bigots. Guess I don't have to now. {shocked}
Here's a little something for your troubles, it'll help you deal with our Feral brethren if you meet any. {giving a reward for a job well done}
He also says that Tenpenny also found the tower and took it from it's previous owner. Implying that Tenpenny also took it by force.
Roy also mentions that he tried paying to live there several times, also that he got shot at some point by Tenpenny (and Tenpenny does brag about shooting his sniper rifle from his balcony at "game" like a safari).
Also let's not forget that usually the first information a player obtains about Tenpenny is that he wants Megaton destroyed by an atomic bomb. So why would a good player help Roy or Tenpenny in this case?
At least Roy agrees with a peaceful solution the first time you talk to him. There is no reasoning with Tenpenny about Megaton.
Imagine if Tenpenny had exploded Megaton himself, then some Megaton survivors would be devising the same plan of letting the feral ghouls in the tower. It would be their revenge. They would speak kinda like Roy does (Tenpenny killed everyone in Megaton, he deserves what is coming at him). Would a good player kill these Megaton survivors at Tenpenny's request in this situation?
The ghouls tried the peaceful way several times (pay to live there like any other resident), all they got was hate speech against ghouls (we can even witness some of this when we first approach Tenpenny Tower and hear Roy talking with Gustav), then we learn Tenpenny shots at the ghouls, then we talk to Roy and he agrees to not go with his plan to kill anyone if the player manages to mediate a peaceful way, then Roy is genuinely surprised and quite happy that he doesn't have to release the feral ghouls and kill everyone.
Then we have 3 Dog reporting that Tenpenny is being evil by not letting the ghouls move in when they can pay to live there. 3 Dog, the "good fight" fighter. The one that will praise the player if he helps the ghouls move peacefully, of berate the player if he kills the ghouls.
It is obvious the game is offering a "good" way, and that is helping the ghouls.
Everything in the game is (sometimes quite literally) telling us that the Ghouls are innocent and just being discriminated at, and that Tenpenny is evil.
Only after the player knows what happens if you let the ghouls in peacefully, does this quest becomes less "black and white", and instead it just becomes black (no matter what you do, innocent people will die and the tower will be in the hands of someone evil).