Am I wrong to be upset and say I won’t ever leave my kids with my in laws again?

So I have never had a good relationship with my in laws, they’re kinda apathetic towards me and have never made a point to get to know me. To them I am just the person that is married to their son. They have done a few various things that have made me not trust them. For one they both have alcoholism so it’s hard to really trust them to begin with. But when I was deployed a few years ago (military) and my husband was also separately deployed, they had POA of our vehicles and possessions. They took good care of my husband’s truck and things but my stuff they “accidentally” left the door cracked to my storage unit for 6 months and moisture, bugs and rats got inside and destroyed nearly everything. They also said my car “randomly exploded” when they tried to drive it. Like the engine exploded. I have no idea how that happened. It cost us thousands of $$ in damages and they never apologized. They have done a few other things too that have made me not trust them but it’d be forever to type out.

Anyway. Yesterday for Father’s Day my husband wanted to at least visit his dad. I said okay because we haven’t seen them since November. We were just planning on staying a few hours since they live 3 hours away. They live in the country in a very small mobile home so most time is spent outside when we are there. They had bought the kids (4 and 2) a bunch of toys and the kids were very happily playing but it was super hot. My MIL suggested “why don’t you and Tom (my husband) go run by Family Dollar and get a sprinkler for the kids? We’ll watch them, it’ll only take 30 minutes.” I hesitated but then again it was just down the road and the kids would have a blast in a sprinkler.

So I agreed even though I was very nervous. They had never been left alone with my kids before but it’s just 30 min right? And they weren’t drinking. Well in that span of time they did not watch the kids and my 4 year old fell in a 6 foot ditch and got cut up by branches and twigs. My 2 year old fell off their picnic bench onto a rock and has a massive bruise on his back. At least this is what they told me happened. For one the ditch they said he fell into is probably 300ft from their house. So why was he out there playing by himself? Why was my 2 year old unattended on a bench? They both have injuries and my MIL was just laughing about it like it’s funny like “oh they’re so clumsy! It was kinda funny!” I kinda snapped and was like “this is why I don’t trust y’all with anything. In thirty minutes they both have pretty serious injuries”. Now EVERYONE is mad at me, even my husband who thinks “accidents happen” and it’s not a big deal. Meanwhile my 4 year old has cuts all up and down his body and face and my 2 year old has a bruise the size of my hand on his back.

Am I wrong?