"Trigger warning" proponents see them in the same terms as nut allergy warnings etc, which for victims of abuse / rape etc must make sense , and I guess must apply equally to fiction / non fiction , ie : a triggers a trigger.
Personally can't think of strong arguments against them. But also find it hard to picture anyone I know, whatever their circumstances, whatever they've been through, wanting them/needing them IRL . But cld be totally wrong on that , and they'll be standard practise in yrs to come.
Don't want to derail the thread here but...
The strongest argument I can offer against trigger warnings is that as someone who has suffered from anxiety in the past and a trainee mental health nurse now I think it is more important to help people work through their anxieties around a difficult subject rather than delineate it as a panic attack 'trigger' and allow person to avoid it rather than resolve their thought processes. Just the word 'trigger' primes a person for a panic attack before they have even had chance to rationalise their situation.
Say a student is in a literature class and they have been sexually assaulted in the past and one of the poems or whatever contains a reference to rape. You could have a TW warning and the person could leave the room and allow their anxiety to debilitate their studies/life, etc. when in real life rape doesn't come with a TW... Or ideally you could help them address their thoughts.
For example: I am in a lecture, rape has just been mentioned, I have been raped and I feel uncomfortable and on the verge of a panic attack, HOWEVER I am safe in the company of my friends who I trust and who are there for me, I am safe and I will not be raped.
This approach is best way forward IMO because it doesn't just allow a person to identify what personally makes them anxious, it actively helps them deal with it as well.
It is far more sustainable and compassionate in the long wrong to help victims who TWs apply to to develop their own ways of coping with anxiety rather than avoiding things which might set it off. I recognise that there's a big problem with victims of domestic/sexual assault in particular not coming forward which means they are out of reach the mental health service, but for all the efforts to implement trigger warnings university counselling services could just run a lecture a term teaching people basic rationalisation strategies and try to give them the confidence to face the real world - where life doesn't come with a bleeding TW.
In my opinion the trigger warning movement resonates with the left's focus on identity politics. I.e. it attacks the symptoms of a problem rather than the cause. The biggest proponents of TWs at my university are the same kind of self-professed 'intersectional feminist' wankers who fail to see the cause of a bad thing and attack the symptoms of it instead - e.g. they call for more black or female CEOs without grasping the fact that capitalism is the structural root of discrimination in the first place, and such 'solutions' would actually make things worse for working class blacks/women. TWs represent the same failure to work out the root of the problem rather than the symptoms IMO.