Bakers have little option but to bake bread and cakes, if they are to remain in their profession; so they have an incentive to point out bread is good for you. Which in moderation it is, so they'd be being honest anyway.
But there is plenty of science to be done in numerous areas, so there is much less incentive for the whole of the scientific community to claim belief in something they knew wasn't so. If investigation in one area ends, something somewhere else starts to be funded.
One can expect the occasional rare individual to be tempted to exaggerate their results, in order to continue funding, but not the whole scientific community (with the exception of a few dissenters).
And the idea that they are all out to pull the wool over everyone's eyes is against the very principles of scientific method. To try to fool the world, even if such a thing was achievable, would effectively be professional suicide. And it would need extraordinary planning to get everyone on board and stay silent about the conspiracy. The very idea is ludicrous.
The problem is that the data shows a steep temperature increase coinciding with the growth of industry; a trend sufficiently different from past trends that we are obliged to look for a different cause. True, climate is not perfectly stable over time, but one doesn't forecast such drastic change within a few centuries from considering the evidence of previous change. So if it isn't human activity tipping the balance, then one has to find a better solution; and one hasn't been suggested yet.
The fact that some folk seize this as an opportunity to make money, doesn't change the data.