again, this is not a debunked theory, but an active research topic.

i've posted several studies at peer-reviewed journals. these are far more convincing than some idiot's opinion on tv, some moron's rant on youtube or some nonsense at somebody's blog.

i would invite you to do the research yourself, rather than rely on the authority of people that deserve absolutely no deference on this topic at all. this is potentially an important lesson in critical thinking, if you look into this properly. 

the reality is that the government is actually spending a lot of money right now in funding research to try to understand this better. that is the state of the current science: we don't understand this well and we're trying to figure it out.

but, there is enough evidence to suggest that there is something to this idea, and that, the more we study it, as we are doing currently, the more we'll understand it.

stated tersely: it is viciously rational to think this is the case. the history of this topic goes through some of the greatest minds in the history of science, most of whom intuited the obvious truth of the matter. if you reject this offhand, you're not thinking clearly.

obviously, you need to quantify the situation properly. there has to actually be enough mass involved to create an actual force. so, no - a butterfly flapping it's wings on pluto doesn't create a lot of energy. but, the sun is the cause of virtually everything around us, enough that it almost makes sense to worship it (almost), and it is certainly capable of creating enough gravitational force to rip us apart.

in fact, that will happen. literally. eventually.

the math is complicated. these are n-body problems. but, i'm in very good company when i suggest that it is in the realm of future science for us to better understand the role that planetary bodies play in earthquakes and volcanoes, enough that there could be predictive science underlying it.

but, we'll have to wait for all those tax dollars to do their work, first.

https://www.usgs.gov/faqs/can-position-moon-or-planets-affect-seismicity-are-there-more-earthquakes-morningin-eveningat-a?qt-news_science_products=0#qt-news_science_products