Arnuld compared to the rest of the prisoners of the Londarz detention facility, he is just a crooked cop. He extorts money from civilians and thinks highly of himself since hey, he is a cop and he is the law or should I say, was the law since he was arrested for cooperating with a mafia boss and his corruption. In terms of weaponry, he has the standard equipment of every police officer, so yeah; he is basically a monster cop.
Back to the Londarz family, Arnuld's attitude is getting to the nerves of Lira and Gien and it seems they want to kill the man. This was when we saw more of the Don's other side. For most of the time, we always see him smoke his tobacco and just stay relaxed. This was one of those moments that he had a hard time in terms of making a decision. Will he side with his allies who are quite helpful for the long run or side with his best friend whose been there for him since they are kids? His dilemma led to something interesting as he gave his best bud a new gun, which I don't find weird until later.
Arnuld is just a crooked cop, he can't do a lot to the family in the long run and that he is the cause of strife the family is experiencing right now. In short, it is best for him to put into cyrostasis. Even if that's the case, the Don still cares for Arnuld as he rather see him put in cyrostasis rather than see him dead in the hands of his men. Remember that a person is not dead in cyrostasis but just compressed into a small figure that is obviously their version of cold sleep. To put it simply, he still cares for his friend's life.
Aside from the media, the government, to be exact, the police are aware of the Timeranger's existence, especially after the media started speculating that the Timerangers are the government's secret police. I was surprised to the reply of the police that they are not associated with the Timerangers since most cops that I know in mass media will either try to cover the story up or claim that these masked heroes are working for them. As for the rest of the Timerangers, they are fine with the media thinking that they are some secret police. At least it will lessen the misunderstanding with the general public! Funny, Kamen Rider Kuuga was airing alongside with Timeranger during that time had some police involvement.