You should not attempt to find your mom a boyfriend.
The world isn't the way you would like it to be.
She wants a guy that could have most any woman.
And her desire, what she will accept does not go down as she ages.
So, the pool that she can find that matches what she wants are all bad-boys.
You will just end up wasting your time, and the time of whomever you try to encourage you mom to meet.
I find it interesting that you'd think they'd all be bad boys. But yeah, I should probably stay out of it.
About the bad-boys, it is just simple numbers
In our Gynocentric world there are very few "Good Men"
Men who are good looking enough AND want to settle down.
They are snatched up early, and usually stay commited.
The guys that you would want to set up your mother with are probably all "Nice Guys", and every one of them she will reject.
This leaves only the Bad-boys
Here, Wheat Waffles explains it fully
