You need to do more research because you have some basic facts wrong. He never met the 17-year-old in person. The second person was older.
No one "chooses" suicide, and even if you think they do, the timing made it clear that the mobbing was the trigger.
We agree that the people who blamed him should not be mobbed in turn. Mobbing can result in suicide. No one should do it.
People should speak out when they think they have been wronged. Then the accuser and the accused should be treated humanely while journalists and the law investigate the charges.
I wrote a little about the consequences of mobbing here: https://comrademorlock.medium.com/how-to-survive-an-online-mobbing-54ac533e7e40