Roommate rant!

I just really need to rant right now... my husband and I rent a townhome with another couple and split the rent equally... This couple is more my husbands friends than my own but I tolerate them... They just seem to lack common sense. This morning they confirmed their lack of common sense when I woke up this morning and found that they left the stove on ALL NIGHT LONG... ALL. NIGHT. LONG... I am infuriated!!!! These people are in their early 20s and they have a kid. I feel like they should know better... I now feel nervous to be living with them. I’m expecting my first baby in April and I just don’t feel safe with these people now. I’m sadly very non confrontational and I hate confronting people.. especially if I don’t know them that well.