If I truly felt my husband was not involved, I would be really upset that my boys couldn't see their father at a time when they probably really need their dad. JMO.
I don't question the motives of Becky, the boys, or even Vega. I think they are all convinced of Sergio's innocence and are trying to stand by someone they think is innocent. I know I would do the same for my husband, because I know in my heart he would never do anything to hurt our children.
Now they could all very well be wrong, for all we know, but I understand their loyalty, particularly if they don't think keeping him from his boys is doing anything constructive.
Yes, the 911 call was REALLY wierd. But I also remember Mark Lunsford being the target and Amber DuBois's step dad and Elizabeth Smart's dad, etc...being considered highly suspicious.
Perhaps Sergio is just kind of a wierd guy and acts wierd. Who knows. Sure, it is suspicious, but I sure hope they are looking into stranger abduction as well.
JMO