[PhilWright]

Written by Chris Patten, a long time Conservative party member that has always been very pro-Europe. So of course he thinks leaving the EU is a disaster, because it goes against his long held belief that the UK should be all-in with Europe.

[me_me_me]

I don't remember name for this logical fallacy but I can think of a simple way of demonstrating, by rephrasing your comment.

Vaccines don't cause autism by Dr. XYZ >Written by 'XYZ', a long time 'Vaccines Support' party member that has always been very pro-vaccines. So of course he thinks 'Vaccines don't cause autism', because it goes against his long held belief that the 'Vaccines don't cause autism'.

Just because someone has been in a 'idea camp', it doesn't automatically disqualifies their arguments.

I don't really care about the topic, but this type of comment is my pet peeve.

Attack ideas not people.

[mshook]

Circumstantial ad hominem fallacy perhaps?

https://en.wikipedia.org/wiki/Ad_hominem#Circumstantial

[me_me_me]

seems like a right fit