You're correct. You should give your time and effort to who you support. Is there anything wrong with others doing the same thing for candidates they support?
Not at all, but when that support is expressed in the “concern troll” format that undermines the supported candidate’s opponents, it should be pointed out.
“Concern Troll” - In an argument (usually a political debate), a concern troll is someone who is backing a candidate, but pretends to be open to supporting a rival candidate, except for their ”concern” about certain named “flaws” of the rival candidate. The idea behind this is that your opponents will take your arguments more seriously if they think you’re an ally just expressing “concerns” about the supposed “flaws” of the opposing candidate.
Usage Example: In the 2012 election, an aide to, say, Governor Smith (R-MN) was caught concern trolling the opposition on forums. While pretending to be open to supporting Governor Smith’s opponent, Governor Jones, the aide argued that Governor Jones couldn’t win because she “wasn’t ready” and had certain “flaws” such as being “controversial” that would prevent her from winning the general election.
On this conservative site, we need to support conservatives. The others can take care of themselves.