Point. Tolerate is closer to the right phrase. Thrall didn't endorse a large scale Horde presence there but he didn't stop the logging activities or the Warsong actively. The city was dependant on them and on the handouts to not run out. By the time Garrosh shows up at the city in late TBC, the situation hasn't improved, that's what spurs his change of mind regarding Thrall in the first place. It's the same as his attitude to what was going on with the Ring of Blood, as @Aucald mentions or warlocks. For reference I'm not making a point about Varian not having a reason to react the way he does emotionally or to have this issue with Thrall, the opposite actually - that because of how relevant his experiences in Orgrimmar and as the king of Stormwind, which was sacked and its city killed by orcs, he has a unique issue with them.