I get that many people want to act as the alpha chad from the get-go, but this is really absurd. Based on this, I believe you go about killing everyone who is in a more authoritative position than you? If you have access to this site then you probably don't do that. Killing people wont scare the others away, it will paint a target on your back as a threat to society both in human and vampire ones.
This may work if vampires have similar damage scaling and reflexes to humans. Even if you kill one or two what's stopping the other vamps from ganging up and killing you. Also, this is considering the other vamps don't use guns themselves.
To do all that the MC would need access to a military arsenal which he does not. And claymores are used to prevent people from sneaking up to you not taking out hundreds at a time . How the hell would you place hundreds of claymores anyway without someone noticing. Similarly with Molotovs as well- how many will you carry to kill hundreds of them. Plus molotov cocktails will be rather dangerous to use in an actual fight, considering the MC shares the same weakness to fire. If hundreds of individuals are hell-bent on killing you, no matter human or vampire, the best you can do is get away from there.
The MC is following a survivalist strategy as he tries to get a foothold in the new world he has been thrown into, which makes complete sense.