You are on the right track here. There wasn't any plan to start a "truth movement" by any group of people. Many of those who first came up with popular truther theories were anti-semitic. But a fact is, that all of them were not.
For example,
Jared Israel came up with the NORAD stand down theory, which is still largely supported by almost every member of the TM. But Jared Israel is a strong supporter of Israel and an avid opposer of any anti-semitic conspiracy theories.
Griffin supports Jared Israel's NORAD stand down theories. Does this mean now, that Griffin is not anti-semitic after all? Of course not, neither does him quoting Bollyn make him anti-semitic.
People here have to understand that these TM leaders want these theories, regardless of the people who came up with them. In many (or most) occasions they may not even know who first came up with these ideas. They just know that this or that theory fits their world view, and they adopt that theory.
Of course, there are some shady occasions when Jones hangs out with Bollyn, probably well aware of his background. Him and Griffin could at least make it more clear, that they support the theories, not the people behind them.
But in general, the entire movement can not be labeled anti-semitic just because many theories they support have originated from anti-semites, because many theories they support did not originate from anti-semites. This movement simply picks up theories they like. Even if we erased all the anti-semites from the history of 9/11 TM, there would still be a 9/11 TM. There are always people, who don't buy the "official explanations" and look for something different. Anti-semites may be well represented in this category, but they do not represent the entire population of people, who doubt the government.
If some regular TM guy claims the towers fell into their footprints, does he have to know that a guy called Jim McMichael first came up with this idea, which was then copied by Eric Hufschmid and Jim Hoffman, which was then adopted by Griffin after he researched for more evidence after reading the Paul Thompson timeline? Can we now claim, that because this regular TM guy had read a Griffin book and consequently claimed the towers fell into their footprints, that he must retract this claim because Jim McMichael might have been anti-semitic? This TM guy probably has no idea who this Jim McMichael guy is, heck, even Griffin probably has no clue! They subscribe to the ideas!
This is very complicated. Although many representatives of the TM fit the description, and they probably should know more about the origins, it's not all that simple folks. But I must say I think it's healthy for every member of the TM (and debunker alike) to understand, that these theories started very early, and they were mostly started by people who were very opposed to anything "official" to begin with. They used this as an opportunity to spread their world views.