Nope, we don't. Just a long military tradition of promoting successful loose cannons into a position where they are relatively harmless. Complete conjecture on my part, rendered moot by Lorca sending Discovery down a rabbit hole.
Lorca didn't do anything. Stamets was messed up after all the jumps he made and the result was the ship is lost.
People are FAR too invested in the whole "Lorca is a Section 31 sociopath Mirror Universe Klingon agent bad guy manipulator rogue Q" theory to accept that a rock is just a rock.