I have a voucher for two free meals and I feel guilty about it.

Not from Chili's. Another place.
What happened was that we were at the table closest to the door to the kitchen. All was going great, everyone was being friendly, no misbehavior anywhere, when someone coming out with a giant tray full of little glass bottles of maple syrup tripped and the bottles shattered everywhere.
We were literally sprayed with glass and syrup. I was picking shards of it out of my leg later that night, and I had to move the high chair and diaper bag so they could get it out from under there. I was finding pieces of glass stuck with syrup onto my purse for a while, too.
They were really nice and asked if we were ok, which was a valid concern seeing as about 50-60 glass bottles of hot syrup shattered on a hard floor less than a foot from us. I said that we were fine. I felt bad that they had such a big mess to clean up.
Everyone had gone about their business when it occurred to me a couple of minutes later that if glass sprayed all over our bodies, it might have gotten in the food too. We didn't feel right demanding a new meal after we just watched them on their hands and knees cleaning glass and syrup off the floor, so we just stopped eating and paid our bill.
I wrote corporate and did a "suggestion" more than a "complaint"...said that in future when something like that happens, maybe they should just replace the meal to eliminate any risk of the customer being harmed by glass in food. I reiterated how nice they all were and how the glass thing was all totally an accident.
Fast forward a couple of weeks, and the manager's calling my cellphone to sincerely apologize for our displeasure. (?) Then I got a thing in the mail for two comped meals.
I wasn't really all that displeased, but I guess my mild-mannered suggestion didn't come across quite right.
Anyway, on the website to write to corporate there was a thing asking you if you felt you were mistreated due to discrimination.