It isn't happening to help people get healthy, if they wanted to do that the government would put more effort into making healthy food options cheaper and sorting out the other root causes of obesity. Eli Lilly isn't doing this out of the goodness of their heart, they want something for their £280m investment.
In answer to your other question, the whole of the Labour right are evil bastards who are only interested in what they themselves can gain from being in power. Same as the Tories.
That sounds like the argument you hear against gun crime in the US. Why not just sort out "mental health"? If you could sort out obesity with a few simple public health interventions, then someone would have done it by now.
From the actual article that was originally posted, "this Government is already taking action to give children a healthy start to life by banning junk food adverts targeted at kids. We’re also reforming the NHS so it catches problems earlier and prevents them from worsening." Obesity is an incredibly complex issue that is affecting pretty much everywhere in the World that is relatively wealthy.
The weight loss drugs *could* end up being the most successful public health intervention in the past hundred years, so it doesn't help anyone to simply dismiss it as political corruption, because you don't like the messenger.