If you don't report it then you are inadvertently giving him the green light to behave like that. You become an enabler, it is as simple as that.
Have you ever had to do it ?
Having been through it, I don't have it in me to blame the women who were targeted by him before me. I blame him. And I blame societal attitudes that make reporting an attempted, or successful sexual assault to be absolutely nothing like reporting other crimes against the person or property.
I know he had never even come close to being reported before. The fucker was back in his original spot where he first started to follow me when after several hours of running like the clappers, reporting, interview and pointless gazing at mug shots the police decided to drive me back up there to see if I could spot him. But despite never having been reported before, he knew it wasn't OK, and he knew it was gravely wrong. Or he wouldn't have taken off like a bat out of hell when I lept in front of a speeding car to try and get away from him. He was just banking on the price women pay for being victimised being enough to make them want to avoid any more pain that day and keep them out of the police station. The victims didn't create and nurture that reality, so why should we beat them over the head for a status quo not of their making ?
It's a bit more complex than "well at least I'm not a dismal failure of a woman who enables wannbe rapists" when deciding to go to the police. God knows not going was the far more attractive option at the time. If I weren't a teacher, if it hadn't been at a time, in a place where my own young female students might find themselves alone, I don't know if I would have had the fire in my belly to fight back the huge desire to just go and curl up in a ball somewhere and shake.
OP I can't promise you a rose garden when reporting. At the time it might feel masochistic. But the effects of this having been done to you can linger. No necessarily in a debilitating fashion, but there all the same. Having reported has been a huge tool in helping myself feel less vulnerable and powerless in that regard. It might be delayed benefit, but at the same it was worth what it cost at the time. It still is. I might not be caperble of walking anywhere on my own like I used to, but at least when DH drives me past where it happened every day I don't think about the moment when my sense of personal security crumbled, I get to think about the little shit's face when the police and I turned up and the " shock and awe" tables got turned on him. Sorry if this is a bit garbled. The gist is... Things get better. Reporting can help in the getting better. But if you can't bring yourself to report, for the love of God don't let anybody give you the burden of being responsible for a sex attackers choices and behavoirs. Because you are not responsible for what he did to you, or what he does to anybody else.