i agree about boiled sweets, choking hazards, unnecessary sugar overload etc
but there might be a downside to never exposing your kids to refined sugars..
ds1 never ate processed foods, sweets, shop bought biscuits, cakes etc as i was very conscious of not exposing him to unnecessary sweet 'treats', he loved fruit so he had something sweet in his diet i thought
but he was of course given biscuits and cakes at the very first round of birthdays and playdates and unfortunately his poor stomach couldn't tolerate the refined sugars and oils and he vomited everywhere, very distressing for him and everyone!
all through his younger years he had sweets after school only on fridays and never asked for them other times but then since his teens he is a sugar addict, so make of that what you will 
so with other dc's i have allowed occasional biscuit, cadbury finger etc from earlier maybe 18m-2yrs..but now i realise they have the same sensitivity for fried foods.. i took 4yr old to mcdonalds for breakfast as we were in town early and i 'nostalgically' thought it would be a 'treat' but a couple of bites of hash brown and vomited, also with fish and chips from chip shop..
so my cautionary tale would be to expose your kids earlier to foods which they will be expected to enjoy in a group situation, as part of our british culture i guess 