why the injections?


Time travel is always tricky, I think this movie is simple enough to work, I don't know why people needs to know the technology used to time travel, if it doesn't actually exist, any explanation will do!
In the other hand I found really unjustified the injections, I think I missed something here and I can't find anyone having the same question.
Why does she use an injection instead of just killing the targets in a normal, unsuspicious way? I mean, the big technology that allows the whole plan is the time travelling, she can go back and kill the original thinkers of whatever idea, but why the injection that allows to kill so grotesquely and having to press a button on a screen when she actually goes and find each one and makes physical contact?
This really bugs me, it doesn't spoil the movie at all, I thought it was very well done, not mind blowing, but the technically great aspect balances the average plot.
Please someone though of this injection thing or have an answer to me?
Thanks!

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This was a plot hole that was contrived for no reason beyond insuring that every murder by the time traveller would stick out like bright light on a dark street to insure that the authorities would know who done it. It was quite frankly dumb as shit. If you could go back in time and take out the people that would be a threat in the future you wouldn't want it to be done in some way that was suspicious... the logical way to kill would have been to make them appear to die from some random disease.... but if it was a non-threatening death the movie wouldn't have worked out because Thomas wouldn't have noticed any correlation to a piano player that dies from cancer while a bus driver has a heart attack... So the injections were just a contrived piece of shit that was necessary for the movies characters to see a pattern.

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Apparently that's the technology the doctor will have developed. Some isotopes which somehow remain connected through the "timestream" when the moon is right.

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Yeah, it was a bit contrived. The injection didn't seem to be necessary for the actual time travel, or vice versa.
One possibility might be that it was a power trip; he could just sit in his office and just click the "die"-buttons.

So year, if she just woul've kill them the "old-fashined" way, no one would've noticed (and thus, no movie).

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