The majority of them (even the one who you said he is agree with the penalty) lived their racing life trying to get away with all kind of penalties (deliberate ones or the mistakes) and bending the rules with the least respect to others(it's not a bad thing , this is how they became the winners), the exact opposite of a steward's job and, how they have valid opinion on a job that they were always the opposite side of it? ex footballer opinion is more valid on refereeing or an ex referee? professional drivers (and their teams) had their enough share in making those rules from the start of motorsport and all of them accepted those rules by coming to that competition, they can have their opinion, disagree or agree, but in real world they don't have the credibility of judging it, they are drivers, those are stewards, 2 different field with some common grounds (enforcing rules). if it is the case of suspecting that an steward is a malicious one, you can be sure the teams have their leverage to make a change,if there is no change it means that the teams deep down are in agreement with them and the theater we watch from the whining teams are just for fan service and making it more dramatic.
Offence happened, lowest penalty received, the lowest is still harsh?ok the rule is bad but the teams and those drivers have the leverage to even make a 2 sec penalty for future if they have valid reasons.
remember moving under braking? because of the drivers leverage we had 3 different rule for it during 3 season! (fine_not fine_ fine) and we called the stewards the inconsistent ones
but hey that's just my personal opinion and sometimes i'm wrong , and also maybe i'm a little drunk , better try ACC now