I can't remember all the details, but there were a few things pointing to Virtanen being a problem.
He showed up to camp not in shape to training camp standards 2 times in the past 5 seasons including the most recent season although he always for whatever reason finds a way to make his way back onto the main roster and continues to win fastest skating competitions at our skills competition. H'es 61 225, and that's pretty big for a a height of 6'1. but his speed is there.
showing to training camp out of shape can mean he didn't work hard enough during the off season.
During the so called Season on hold, he took a lot of heat for taking a selfie video of him while driving, although this was more a representation of immaturity and to some extent recklessness since it is illegal in B.C to use a phone and drive at the same time.
There was also a video of him at a club, 10 days before our training camp this summer, (although this one based on their own opinions) since clubs are allowed to open at this point, players are known to "visit" clubs. Some fans didn't like it he went to a club, although they are allowed to be opened, some fans though defended his right to go wherever he wants if he's not breaking the law! He's not a kid he's an adult etc etc. Others though with trainimg camp around the corner he shouldn't be going out to places he doesn't have too there is a chance he can catch covid 19 and effect the entire team.
He has more maturity issues then poor attitude. As a person he's not a bad kid at all. Fans that met him in person always have nothing but positive things to say about him. On the ice, he will protect his teamates and not back down, case in point in round 1 when Pettersson got smoked from Behind Virtanen dropped the gloves with the culprit right away. Virtanen did his best to make himself useful by just finishing checks after checks. Despite his limited ice time during the playoffs he leads our team in recorded hits.
I won't argue about peoples opinions about his immaturity. Although I will say I hope people don't mix up bad attidue with him just being immature. Im my opinon bad attitude is someone like maybe Drouin or Lias Andersson, both these players refused to stay in the AHL and demanded a trade, etc etc. Virtanen didn't do any of that and literally does what Green literally tells him to do.
Overall I think playing in his home town city with the spotlight on any player can be big for him. A change like going to an american city where the spot-lite is not all on the NHL team can really help, since they have a NFL, NBA and MLB teams in Boston.