To be cross with my Dparents for telling DS that cowcatchers are bad?

[Reluctant2ndtimer]

The dc and I have stayed at my DPs house and DS is in their bedroom showing them his train book. He told them he used to be an old train with a cowcatcher but that now he is an underground train.
Mum said 'cowcatchers are terrible dangerous things, they catch children.'
Dad went on to agree with her and they both started a bit of a rant about the dangers of them.
IABU to tell them off? He is only 3 and not likely to ever come across a real cowcatcher Ffs. He doesn't need to be told this IMO.
They had me terrified as a young child and not so young adult of escalators by telling me about children getting their legs eaten. Etc etc, I think they forgot how much children believe.
I realise that there are worse things in life and they are fabulous parents and gps in every other way but DS is my pfb

Arghhh fakebook, i remember that advert!!
it didn't help that i saw a snippet of as horror film where someone got sucked in at one end and came out as a smear at the other end. i think i was already scared of them before that tohugh to be fair. it might have been that sodding Welly.
MrsTerrys that articla is horrific, doesn't anyone realise it's not the Crocs that are to blame - it's the flesh hungry escalators!? shudder

Years ago, I worked in London and arrived at Moorgate one morning, ran down the escalator as you do to get to another line but fell on my front at the bottom. I was wearing a pale turquoise jumper and no coat because it was a very warm day. What happened? I had two large black discs on my chest. I had to spend the day like it.