No, but it's a fair point, that it's potentially irresponsible to misrepresent a positive and indeed necessary cause such as environmentalism through a ridiculously evil supervillain like Ra's. Even if it's all in good fun and in the original spirit of the creation.
But, while most environmentalists are harmless, there are real eco-terrorists on earth, such as the Earth Liberation Front. Isn't Ras simply an extrapolation of those types?
And isn't worrying that Ras is going to make environmentalists look bad about as silly as thinking Two-Face is going to District Attorneys look bad?