Please be in the situation to be informed enough to have an opinion instead of discharging your emotionally based gut-feeling on the internet

You don't need to be a parent to be informed enough.

It is very reasonable for parents to evaluate and to inform themselves to know what is necessary and what is not and it is only the parents choice what they decide for their own kids.

You can objectively know what actual scientific research has shown - that vaccines are NOT actually a cause of autism. That's not an opinion, that's what the research shows.

The problem is that there is a lot of misinformation out there and that's what OP is angry about - the misinformation that is leading to parents thinking they are making informed decisions when they are not.

The assumtion parents would want and chose a worse option than somebody who never was in that situation is illogical

He's not saying that parents want a worse option. The vast majority of parents are well meaning and want the best for their children. He's saying that parents think they are choosing a better option when they are actually not doing so because the information they have gotten, whether it is from friends, bad doctors (yes, doctors who think vaccines cause autism are bad doctors) or otherwise is WRONG and has no basis in actual evidence.