Not really, the evidence that ldl causes heart disease and statins prevent deaths is very, very, very strong (lots of clinical trials, lots of causal evidence e.g. Mendelian randomization). LDL is extremely harmful!
So you are saying the human body manufactures a substance that is extremely harmful to the body. And yet lowering it artificially can lead to issues such as loss of short term memory. The body needs cholesterol! You could qualify your argument by saying that excess LDL is harmful.
The body needs SOME. Evolution doesn't care about when you die, just that you reproduce first. Even the highest cholesterol cases generally have kids old enough to have their own kids before they die. That is enough for evolution to not care.
As someone who lost the genetic lottery (has the high cholesterol gene) you bet I care. There is every reason to think that treating cholesterol will increase my lifespan - I'm hoping for quite a few more healthy years.
The body can produce needed cholesterol locally just fine. The PCKS9 inhibitor trials show that having basically no serum LDL is not harmful. People that have the genetic mutation that results in no PCKS9 have extremely low rates of CVD
