Particularly because it sidesteps the things the company actually did (areas razed to the ground include 25,000 hectares of habitations in Indonesia that are home to the critically endangered orangutan) while at the same putting the blame on consumers (just do xyz, why wouldn't you).
And who can forget those pesky journalists, reporting on stuff - how dare they.
IMO, this is exactly what illogical manufactured outrage looks like. We can place blame anywhere down the line: workers in Indonesia who personally work to produce palm oil; the company that hires those works; Mondelez for buying the palm oil; customers for eating Cadbury eggs. I'm being told to hold Mondelez morally responsible for the situation when they are not. They certainly have the most power to stop doing what they're doing. That doesn't stop another company from buying palm oil.
Ultimately, the Indonesian people need to care enough about their orangutans to protect them. Or everyone needs to stop buying palm oil.
The argument here is that Cadbury is effectively turning a blind eye (intentionally or negligently) to what their supplier is doing to meet demand. For an example of companies which actually do care about their responsibility all the way up and down the supply chain, go have a look at the Supplier Responsibility statements and reports put out by big companies like Samsung (https://www.samsung.com/us/aboutsamsung/sustainability/suppl...) and Apple (https://www.apple.com/supplier-responsibility/).