Apologised for the essay but I hope I can offer some input. I specialise in assessing foster carers and have almost 20 years experience working with children at risk or in care.
The wider family support network of applicants is a significant part of my assessment of new carers.
References & interviews are generally conducted unless there is good reason not to. Your views would certainly form part of the assessment. No stone is left unturned and rightly so in my view. A situation like this would be a significant problem for my personally.
You are certainly entitled to your views OP & I have every deepest sympathy with what your have endured in childhood.
I am confused as to whether the notion of fostering re-triggers your trauma or if it is specifically the thought of children entering your home because some children in your past stole from you & treated you poorly. There is certainly no reason whatsoever to believe that a child would steal from you or treat you poorly now - simply by virtue of being fostered due to being a victim of neglect, abuse or orphaned.Afterall, you didn’t steal or treat others poorly when you were in foster care. Likewise some of the most privileged children can be cruel and steal. Some of the most beautiful children I have ever met in my career have been those in care.
Quite honestly this would pose a professional dilemma for me. Children in care, as you will understand first hand and much better than me, often experience the cruelest treatment because they are seen as different, less worthy or unwanted. They need the sanctuary of a foster placement where they feel valued, secure and loved. They would certainly sense when they were not wanted - e.g. when birth children say they have a lovely time at nanny’s house at the weekend - the house they aren’t allowed to visit because they are ‘foster kids’. It would be so utterly stigmatising for them & hurtful.
I don’t say this to patronise you, I have never walked in your shoes. This is simply the reality. Your child will need to make a choice over whose needs they put first and this is a huge decision. As you say, birthdays, Christmas, the most special times families share if they are fortunate enough.
Even if you meet outside your home will you hold the same prejudices that stop you from wanting them in home? Would you view them with suspicion. Would being around them simply upset you and dredge up your personal trauma?
I think you need to have some really frank discussions with your child about how to go forward. It really won’t be as simple as just not allowing the fostered children into your home - it will have such serious repercussions for your family relationships and their wishes and hopes.
I wish you well whatever the outcome is.