It's sad that solar overall is hated by some people. Tokyo decided that every new built house must have solar, that is good IMO because it's free space, but now criticized. Anyway note that Twitter and Yahoo News is heavily biased.
Due to a shrinking population in Japan, there are a lot of left over farms (which are quite flat) being converted to solar farms, it's quite surprising how much solar you see in Japan nowadays.
There are also old mountains (which have been decimated from mining) being covered in Solar panels on their south facing side, these are rock faces so not really prone to intense land slippage. I can't think of a better use for them right now.
Yes Japan has a lot of eathquakes etc, but I don't think this means you can't build solar farms.
Yes, there was a case where a landslip killed a lot of people due to an illegally installed solar farm in a slippage area? It doesn't mean solar was to blame though?
I don't really agree with your comments sorry.