Aside from the Japanese issues, he is actually being investigated for corruption and embezzlement in France as well for holding a party for his wife and charging it to the company, it might escape the legality of it as it was also the 15 years anniversary for the car company, but all invited were 99% his family and hers. It is a direct trust/ethics issues that the Lebanese revolutionaries don't want. Also the apartment he is staying in in Ashrafieh is the property of Nissan, a Nissan official came to it, it was filmed on TV and was trying to talk to Carole or Carlos to get the property back, eventually he couldn't get in touch with anyone.
Of course a man tainted with such ethical issues would not be stepping into politics at the right time in Lebanon, he missed the train he would have been the best candidate on a Hariri, Jumblatt or Berri list.