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.
Yes, and Germany will probably not be too dissimilar. The difference in magnitude here comes from just looking at directly emitted CO² vs all greenhouse gase emissolns in general. If you add all those up, methane emissions particularly, the picture becomes a very different one. This is also what the oeko institur is talking about their post (emissions from lifestock), so it makes sense to care about that.
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!