I wouldn’t do it everyday, but when given an opportunity, and done privately, in a subtle and respectful (certainly not to chastise) manner – then, yes, it is actually a mitzva to not passively allow a fellow Jew to transgress the Torah, especially publicly such as desecrating Shabbat, (G-d forbid). The Rambam states that one must do this until his friend slaps him in the face, but under no circumstance is one to embarrass his friend in public by correcting or rebuking his behavior.
Judging a person’s neshoma is outside the parameters of Torah observance, but judging behavior is certainly possible.
Concerning the time spent watching TV, it has been explained to me that one of the main (if not the primary) differences between the chareidi and MO hashkafa is found in how one interprets Vayikra 26:3 (IM B’CHUKOTAI TEILEICHU V’ET MITVOTAI TISHM’RU V’AHSITEM OHTAM). Rashi brings that “toil in Torah” is an integral part of being observant. It is simply not enough to “strive to be 100% observant in Torah and Mitzvot” without dedicating a significant amount of time to learning Torah (or supporting those who do dedicate their lives to learning, if learning is beyond a person’s capability). Watching TV is time spent that otherwise could have been used to study; and we are taught that one will be held accountable for that choice.