What’s wrong with no water pollutants? It’s around drinking water reservoirs so they don’t get contaminated in a case of an accident…

No argument here. We need more trolleybuses.

That’s true but still those batteries are significantly smaller than those of BEV buses - usually trolleybuses with batteries have 5-15km of range compared to 200-350 km of equivalent BEV buses which also means that the trolleybuses are significantly lighter than BEV buses, which helps with efficiency of electricity utilisation. Another efficiency factor is that not having to charge and deplete a huge battery will save quite significant ammnount of power that is lost as heat during battery operation.

Nothing is black and white you know. No decision is 100% good or 100% bad, we live in a sepectrum where some decisions may be less bad than others and that is the point.

Also current batteries will use cobalt or lithium, other options are either not efficient enough (like metal hydride or sulphuric acid batteries) or developed enough - solid state batteries, or LiFePo.

Also current BMW BEVs are still using lithium based batteries, whose mining pretty much is environmental disaster as a process.

The best thing trolleybuses have going for them is their relatively low dependence on rare earth elements in production in contrast with BEV buses with their large batteries. Trolleybuses environmental toll is way smaller and it makes producers and operators way less dependent on third world countries devastating the environment with slave labor.