Too much nonsense here to answer all but ...
The French should care, whether the UK is in the EU or not, because they should want to be decent neighbours rather than dregs of society, and they have a duty of care regarding stopping folk risking their lives in unsuitable boats, to start with.
Not being in power for x years does not give anyone immunity from wrong doing, which is what needs answering, as per the thread title..
And while on the subject, it should be obvious that an opposition plus an obstinate HoL, plus pressure groups trying to cause issues for the nation, can easily combine to obstruct the will of government. Not that the government are all behind doing the right thing anyway, what with an apparent desire to bend over for global groups' demands, and the lack of guts to leave the ECHR and trigger article 16 to rejig the NI border issue. Right bunch the lot of them. But none of that lets Starmer off the hook. It is clear he has a lot to answer for, regarding his personal activities with groups trying the thwart the will of the people. There is no need of apologists for him.