This school
did have better security. And still 10 kids died.
This is basically a variation of the
"No true Scotsman" logical fallacy.
You've argued that (paraphrasing) "School shooting deaths wouldn't happen if they had security officers."
Then, when Florida happened, you said (paraphrasing) "Well, obviously they needed
true security officers. That guy was a coward."
Then, when Texas happened, you said (paraphrasing) "Well, obviously they needed
better security officers."
And you will continue to move the goalposts each time new evidence is presented to debunk your argument.
P.S. you're also using a different form of fallacy when you say "something Democrats will not discuss".