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I think this is more of an exception. Teaching strikes generally aren't received that well.
I think the difference is strikes where people can see the action directly affecting them (having to look after kids, tube not running, etc) whereas a far smaller number will be affected by the junior doctors being on strike.
The other issue too is the high turnout and high percentage in favour. Some of the tube strikes over the years have had turnouts under 50% and those in favour just over 50% so you're looking at an absolute value of only about 25% in favour.
There's obviously a whole other argument about permissible voting methods, etc but ~ 75% being in favour makes it seem a much bigger issue.
Odd how collective action among the professional classes is not viewed in the same light as collective action among the working classes.