Already mentioned this in a subcomment. Your graph is about CO² specifically. The oeko institut talks about emissions from lifestock, which is mostly methane and a very significant and potent overall contribution to global warming.

In the US, farming accounts for something like 10% of GHG emissions. Industry is the largest producer, but it “only” accounts for 30%, which is a lot, but it’s only 3x agriculture.

Why should I not kill somebody? In Germany, there were a bit over 200 murders last year. One more would be less than 1/2 %. And globally it is really negligible. Same logic!

Death by 1000 paper cuts. If everyone looks at their sector and says they are irrelevant in the broader picture, then no one will change.

Even the worst polluters can rationalise themselves with just a little mental gymnastics.