Well OP, let's look at some issues.
Firstly, power WILL ALWAYS be abused, so we should be extremly careful who we give it to.
Secondly, there are some flaws with your assumption that people believe in some sort of conspiracy and are therefore stupid.
15 minute cities are a an idea from the 70s, they were never adopted because they are are impractical and don't work in the real world. The infrastructure isn't in place and would cost vastly more in tax expenditure than we generate in tax revenue. Also the climate and the topography in the UK isn't suitable for cycling or walking to become legitimate forms of transport. As for the whole "control" aspect, this is true. Labour's Draft Transport Policy is to "Introduce a modal shift away from independent means of travel", that's political speak for introducing policies which take away citizens choices and restricts their movements via government controlled mass transit systems. This isn't a conspiracy theory, it's a published manifesto. Just look at what's happening in London with the expansion of the ULEZ for a glimpse of how power is abused, ability to travel independently is taken away and people are made to pay for it to happen. So no, 15 minute cities and ULEZ zones are very much a power grab and if allowed to happen will be the greatest stripping of basic rights since lockdown.
And as for lockdown, that was an abhorrent abuse of power. It can NEVER be allowed to happen again. Covid was a man made virus, which was most likely leaked by accident from a lab. It was circulating widely across the world for months before it was "first discovered". It was a real virus, but the reaction to it was a manufactured "crisis" which has devastated world economies and societies. Again, not a conspiracy theory, but a fact.
Look at "Climate Change Theory" and you'll get a glimpse of the magnitude of the conspiracy theory issue. The obvious cause of all problems humans face comes down to only ONE issue, and that's population. There are simply too many people alive on this planet. Pollution comes from people, the root cause of all environmental issues are the presence of humans in that particular environment. The Green Warriors of this world are either being deliberately obtuse or they are seriously uneducated and lack any form of critical thinking. Instead of "Just Stop Oil" their slogan should be "Just Stop Children". And this fuzzy thinking isn't limited to a few well to do pensioners and some spoilt rich kids, nobody will discuss it. Why do you think that is?
Climate Change is a very convenient stick for those in power to use to beat people into submission. As long as the point blank refuse to discuss the real problem why should anybody listen to them?
If you really want to frighten yourself, have a watch of the interview with Christine Lagarde where she gives some details about the introduction of the European Digital Currency.
Ever heard the phrase "You will own nothing and be happy"?
That IS precisely the policy that the EU are introducing. Lagarde has stated that access to money in your account will be dependent on your behaviour and such access will be not be a citizens right, but conditional.
Quite a lot of conspiracy theories are actually political facts.