actually, there is no certainty what would happen if hector 3 decided to screw causality and kill hector 1 and/or 2 (or indeed, mess with any other key event).
the usual simple conclusion (kind of a la back to the future) is that the now-causeless entities simply fizzle.
there are also other far more insane consequences suggested, such as the entirety of existence would supposedly crush itself into oblivion due to a tear in the fabric of reality... or wormholes going inside out... or quantum effects going bazonkers.
either way, there isn't any clear science on what exactly WOULD happen if a time traveller decided to break causality. some theorists think that it wouldn't be possible -- kind of shown in the film, when hector 3 inevitably blacks himself out after bumping the white car, thereby making it impossible (i.e. not enough time) for him to stop hector 2 from going back to the house. the van's crash also led to hector 3 having a moment of helplessness (when he radioed the scientist), and led to him meeting the bike girl, who brought him back to the house... the whole chain of events leading to her death. the inevitability of the prime timeline is consistent in the film, as far as i can see.
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...as for the dickishness, i guess the film didn't handle it too well. hector 2 was clearly panicking -- hugely shocked when he called himself and then recalled the exchange from earlier. the scientist could've done a bit more exposition there and then, and warned him about the unknown consequences of negating causality, perhaps with some dramatic geek dialogue to instil fear and convince hector 2 to stick to the timeline he saw earlier.
if the scientist had done that bit of exposition, then the fear of messing up causality, along with the need to conceal the existence of the time machine (scientist not authorised to activate it) could explain his dickish behaviour.
perhaps hindered by the creepy head bandage, he did try to show some civility -- he turned away as the girl took her top off. but he also had to maintain sufficient menace to compel her to obedience... so he kinda had to keep up the creep factor, given the lack of time to explain his need to replicate an odd series of events.
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