Death is inevitable, in as much as we all know we're all going to die someday, we just don't know how or when it will be. These deaths you have chronicled relating to Liverpool could as well happen to any other club. So it's really not something we should be thinking it's a problem about Liverpool. Don't know if that's what you're implying. In all, one thing is certain, Jotta left too soon!
There is still a mystery surrounding his death, yet to be discovered. Well even if someone has planned it, car accident is one way to keep a murder case clean without any trace.
Diogo Jota's death feels fishy, a car wont catch fire without any solid reason. Investigations should be done, starting from where he went or where he was returning from.