A lot of people get tattoos for stupid reasons. Maybe Rudy wants one because she likes it. She seems like a rationale woman, I'm sure she deep down knows what she wants.
The fact that it's getting more popular is because a lot of people want to tat themselves up for reasons like looking cool or just showing off apart of their body.
Then you have those who have tattoos for meaningful purposes.
I'm sure that tattoo Rudy posted means something to her.