But you don't think the Democrats realize that?
Yes, which is why I think the "pack the electorate" is the theory that has the strongest case.
The willingness to do it has been established (when several high profile democrats, even a few in the democratic primary advocating for expanding the vote to 16 year olds)
Obviously the motivation would be there to do it if discussing a group that demographically, has favored democrats over republicans by 2:1
There's been a lot of "Demographic conditioning" in terms of who certain groups vote for, and as I noted before, sometimes they're not even remotely close on the issues, it's almost of a form of cognitive dissonance.
I used the example of republicans and gun control earlier.
The moderate democrat views on guns actually more closely align with where the majority of republicans are at on gun control (when asked about the facets, individually), yet they'll vote for the republican if given the choice because it's been instilled that "that's the pro-gun thing to do", and will base their vote on an arbitrary grading system by the NRA, for which many don't even know the metrics being used for the grading system. "So & So gets and A-, the other guy only gets a D-...so the first guy it is!"
Abortion has a similar thing going on. If you look at where the majority of democratic voters are at on the issue, it's not the "legal at any time in the pregnancy, for any reason, and taxpayer funded" which is what democratic lawmakers are often advancing. It's a much more moderated position. But yet, a position of "legal up to 14 weeks, but after that, not allowed except for the 3 approved exception scenarios" when pitched by people here gets branded "anti-choice, anti-woman" despite that kind of policy being the norm throughout Scandinavia.
Sometimes the demographic conditioning is even more superficial than that.
If you look at the Black vote for democrats and the White Evangelical vote for republicans, 85-90% all vote the same way. Clearly people are making the choice to vote that way, but I would think it's highly unlikely that any one group (based solely on a demographic commonality) would have that level of agreement on social issues, economics, and military policy. To me that sounds more like the result of community conditioning "You're XYZ, so you're supposed to vote for this party"
If I got a group of people together for the "Annual meeting of pizza enthusiasts", and 90% all claimed to be in lockstep agreement on a series of hot button political issues, my first thought would be "Okay, what has Dominos and Papa Johns been telling these folks?"
There are no other reasons to advocate a more liberal immigration policy than that favored by European nations?
The only alternative reasons I can think of would be even more cynical, and/or would represent something even more petty.
A) could be a mechanism for justifying raising taxes and budgets (and then load up the budget with a bunch of pork)
B) could be "the republicans want it to be stricter, so we have to take the opposition position just cuz..."
C) could be simple pandering to the current voter block of 18-25's due to the perception that "anything uber-progressive will appeal to them"
...a reason that doesn't make the list for "likely motivations" would be "Politicians are just kind souls who want to do something out of the goodness of their heart for pure reasons without any ulterior motives"