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Because using DNA collected from a victim of crime to prosecute them for a later crime is probably a violation of 5th amendment rights.

The next logical step if you don’t think the 5th was violated is collecting DNA from everyone (eg: repurposing COVID swabs) so you can identify all the potential suspects from your sampled population while completely ignoring that someone from outside the sampled population could be the person you are looking for.

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I don't see how this is unreasonable, when already we collect photographs (with ID cards). Or, more aptly, we already collect footprints of newborns, for purposes of identification. Collecting DNA for purposes of identification is almost the same thing.

Being able to positively identify people is a reasonable function of a government, including democratic governments.

DNA testing is not positive identification.

The direct proposal was not to collect data from victims, but all innocent parties . no need for extrapolation.

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