You still seem to be under the impression that the thalmor have this insurmountable force just waiting to pounce. A lot of the bosmer populace is dead(The thalmor supporters were a minority among them hence the pogroms and mass purges), and while Elsweyr has allied with the thalmor as a client kingdom, they don't particularly seem to care about fighting the war.
Keep in mind when the Thalmor attacked cyrodiil, the imperial legion was at the lowest its ever been and was also completely unprepared.
They STILL lost. Not only that, but the entire attack force was completely wiped out to the last man. Their second attack force was eventually driven from hammerfell without intervention from the empire. Real Barenziah notes that elves have terrible conception rates(2 children being uncommon, 4 the most they've ever seen), whereas men do not have this problem. Hence they fell back to their appear threatening and use subterfuge until we can get ready again approach.
Very good points. Two reasons that make it hard to support the empire.1,They try to kill you.IRL, if I was abducted by my gov, and barely escaped execution or worse,Id find it hard to support it.2. They are giving the enemy(the thalmor), a people that,as we have seen, thrive on subterfuge/covert actions full access to their lands.Its no wonder there are insurections/kidknapings,ect going on in skyrim.By helping the empire, Im spreading their influence accross skyrim(there are no thalmor walking around in SC zones as far as I know).
But there are plenty of reasons to support the empire as well.Ive had the game sence the day it came out,and tried both sides,and,in my main file, have still not made a decision on who to support.