Should I be mad at my best friend for dating a WAY older man and having his kid after only 4 months?

So, I have been mad at her for a while about this, and I finally told her. Of course, she was not happy with my opinion, and I tried to explain to her why I was concerned. My parents told me that if she’s happy, leave her be, but I can’t see anything good coming from this. Anyway, here is her situation…

He is 17 years her senior, he has kids with two other women, they have been together for 4 months, she moved in last month, she is pregnant with his kid, she lost her job, and she has a 2 year old with another man that she is struggling to take care of.

Am i making a big deal? Am I justified in being upset with her? BTW, we have been best friends for 10 years, so we are seriously close. Also, I am NOT trying to convince her to leave him. What’s done is done. She is going to have two kids and no job, so she has literally no where to go if she did. She and him made perfectly sure that they were stuck together. I feel like he is only keeping her around for the sex and companionship, not for love, and she is with him for the money (because he makes a lot). She wants me to support her, but I just CAN’T. I don’t know why…. perhaps my morals? I don’t know :S