[bryanrasmussen]

>scientists being branded “climate alarmists” (even as their models consistently under-estimate global warming)

the attacks come from different directions - climate alarmists attack comes from without the scientific community (political, corporate)

climate denialist or antivaxer attacks generally come from within the scientific community, generally from experts in the field from which results are being denied.

The people who then want to support climate denialism can then say the scientists are non-scientific because they are taking sides, providing another useful tool of attack.