Good grief! There's nothing wrong at all with trusting, especially the company you work for. It's like being patriotic.
Therefore, I am happy to have the matching stock that my company gives me, but those are the only shares of my company I own and I have the rest of my finances diversified.
I probably should sell some of my vested stock from a purely logical investing perspective, but sentiment dissuades me.
In any case, I know that if anything goes wrong with those shares, while it would be painful it still wouldn't submarine my retirement.